NCSP 2 nd Ed Chapter 4 Solutions Forces
|
|
- Kerry Anderson
- 5 years ago
- Views:
Transcription
1 NCSP 2 nd Ed Chapter 4 Solutions Forces Question 1 (a) Answer 2.5 N north (b) Answer 101 N north (c) Answer 32 N, S72 W or W18 S (d) Answer 16 N, N22 W or W 68 S NCSP Chapter 4 Solutions 1
2 Question 2 p77 Answer. (a) Forces are balanced as the force vectors are the same length. (b) The forces on the book would not be balanced. The only force would be the weight pointing down, so the book would accelerate downwards. Question 3 p78 Answer. (a) When pulled slowly the thread A would have to support weight of the ball and the pulling force of the string so string A would break. (b) when pulled quickly the inertia of the ball would resist a change in motion so the bottom string would break. Question 5 p78 (a) the water keeps moving in a straight line when your hand is pulled away so the water is flicked off. (b) the water keeps moving in a straight line when the edge of the umbrella edge keeps turning towards the centre so the water is flicked off. (c) while riding you and your bike tend to continue in a straight line so you don t fall over. When stationary, there is no force keeping the bike upright. (d) falling off a building is like jumping into a swimming pool except that the landing is done over a shorter time when falling off a building. The rapid deceleration is what kills you. Q6 p80 Question 7 p82 (a) a = (v-u)/t = (25-0)/8.5 = 2.94 ms -1 ; F = ma = 1000 x 2.94 = 2940 N. (b) a = F/m = 25/15 = 4.6 ms -2 ; v = u + at = x 2 = 9.2 ms -1. (c) m = F/a = 1000/10 = 100 kg; a = (v-u)/t hence t = (v-u)/a = (40-10)/10 = 3 s. (d) a = (v-u)/t = ( )/ (1.5 x 60) = 0.25/90 = ms -2 ; F = ma = 200/1000 kg x = 5.5 x 10-4 N. (e) m = F/a = 150/(-2.2) = kg; v = u + at or u = v at = 0 (-2.2) x 4 = 8.8 ms -1 Question 8 u = 30 ms -1, v = 0 ms -1, s = 100 m, m = 2000 kg. Calc F v 2 = u 2 2as; 0 2 = x a x 100; a = (0-900)/(2x100) = -4.5 ms -2 F = ma = 2000 x -4.5 = 9000 N Question 9 u = 173 km/h = 173 x1000/3600 = 48 ms -1 ; s = 0.66 m; m = 55 kg. Calc F NCSP Chapter 4 Solutions 2
3 Acceleration (m/s^2) v 2 = u 2 + 2as; 0 2 = x a x 0.66; a = -2304/(2 x 0.66) = ms -2. F = ma = 1745 x 55 = N (or N to 2 significant figures) decelerating force. Question 10 (a) False. As a = (v-u)/t you get the same acceleration for both situations, thus F will be the same too (F = ma). (b) True. For rest to 60 km/h over 100m: v 2 = u 2 2as; (60 x 1000/3600) 2 = 0 2 = 2 x a x 100; a = 277.8/(2 x a x 100); hence a = 1.39 ms -2. For 200m: a = 277.8/(2 x a x 200) = 0.69 ms -2. This half the acceleration so the force will be half as F = ma. (c) True. However, it may be moving in a direction opposite to the net force but will always accelerate in the direction of the net force. For example, a ball thrown upwards will be travelling in the upwards (positive) direction even through the net force (gravity) is down (negative direction) and the acceleration is directed downwards (negative direction). It will move upwards (positive direction) but will slow down until it reaches zero velocity at maximum height and then will start to accelerate and speed up downwards. (d) False. The force is proportional to the acceleration, and as the acceleration is equal to the change in speed divided by the time elapsed, the time is important. Question 11 Graph suggests acceleration is proportional to the force. Graph of Force vs acceleration y = x R² = Force (N) Question 12 (a) Hanging mass Mass of glider and m2 Accel Applied F m1 (g) (g) (ms -2 ) (N) NCSP Chapter 4 Solutions 3
4 (b) 12 (c) Force is proportional to acceleration (linear) 12 (d) If friction was present the net force would be less and the acceleration would be less. 12 (e) The hanging mass would be kept constant and thus provide a constant force. The mass added to the glider could be changed. Question 13. (a) the racquet is hit by the ball; (b) the road pushes back on the horse; (c) the earth pushes back against the horse s feet; (c) the ground pushes back against the Click Beetle s feet; (d) as the Earth pulls the man towards the ground the reaction is that the man pulls the Earth upwards towards him. Question 14. (a) FN = mg = 2.5 x 10 = 25 N (upwards direction); (b) A large mass of 500kg would have a downward force of 5000 N due to gravity. The normal reaction would have to be a 5000 N force upwards. It is unlikely that a table could provide this and the legs may break. Question 15. (a) FW = mg = m x 10 N on Earth. On Saturn FW = m x 10.5 N. Hence, on Saturn the weight would be 10.5m/10m = 1.05 times as great; (b) The Earth is not a perfect sphere, and the distribution of mass is also not even. NCSP Chapter 4 Solutions 4
5 Question 16. (a) A mass of 7 lb 8 oz = 7.5 lb = 7.5/2.2 = 3.4 kg. FW = mg = 3.4 x 10 = 34 N. Congratulations to the mother and father; (b) you could use a Wig-Wag machine that measure the rate of oscillation of a metal bar (see Figure 4.10, page 78). Question 17. Apparent weight is not considered a physics term but is used to show the weight of an object as measured on a spring balance. The weight of an object doesn t change on Earth as it is always equal to FW = mg (= m x 10) N. It is better to use the term Scale Reading on a balance calibrated in Newton. (a) when floating, a 70kg person has a mass of 70kg and a weight of 700N. Because there is an upward force supplied by the water and equal to the weight, the apparent weight or scale reading is 0 N; (b) When free-falling, the weight is still 700 N but scales under the body of the person or spring balance attached to the body would be also in free-fall so the apparent weight would be zero; (c) the balance would have to provide an upward force to support the person s weight (700 N) but also provide an accelerating force upward equal to m x a (= 70 x 0.5 = 35 N). Thus the scales would read 735 N and this would be the apparent weight; (d) when the lift accelerates downward the scales would have to provide enough force to change the downwards acceleration from 10 ms -2 to 0.5 ms -2. It would only have to provide a force of F = ma = 70 x 9.5 = 665 N. So this is the apparent weight. You could also think that 35 N of the weight was used to create the downwards acceleration of 0.5 ms (a) FN = FW cos = 30 x 10 x cos 35 = N; (b) As there is no friction FP = FW sin = N; a = F/m = 172.1/30 = 5.7 ms -2. Question 19 Fnet = 10 N = ma; a = 10/(2 + 3) = 2 m s -2 T = m2kg a = 2 x 2 = 4 N to the right Question 20 (a) Fnet = F1 + F2 = = 68.6 N a = Fnet/mtotal = 68.6/(15 + 8) = 2.98 m s -2 T1 = force to support 15 kg less the accelerating force (because it is acting in the same direction as the weight) = x 2.98 = N NCSP Chapter 4 Solutions 5
6 T2 = force to support 8 kg plus the accelerating force (because it is acting in the oppositee direction as the weight): (8 x 2.98) = N Note that T1 has to equal T2 (which it does). Alternative solution: For 15 kg block (m1) falling: FW1 T = Fnet T = 15a (a is positive as it is directed down as is the weight) T = a (Equation 1) For the 8 kg block moving up (a is negative): FW2 - T = 8 a T = -8a 78.4 T = -8a T = a (Equation 2) Solve simultaneous equations: Equation 1 = Equation 2 T = a = a 68.6 = 23 a a = 2.98 m s -2 T = a = = N (b) Fnet = F1 + F2 = mg + 0 (the weight of the 0.8 kg mass does not pull on the string) = = 9.8 N a = Fnet/mtotal = 9.9/1.8 = 5.44 m s -2 T1 = m1g = m1a = = 4.45 N T2 = 0 + m2a = = 4.45 N (as expected T1 has to equal T2) Alternative solution: For 1.0 kg block (m1) falling: FW1 T = Fnet T = 1.0 a (a is positive as it is directed down as is the weight) T = a (Equation 1) For the 0.8 kg block sliding horizontally: T = m2a = 0.8 a (the weight has no effect in the horizontal direction and is in the same direction as the tension (T); we also assume friction is zero. T = 0.8a (Equation 2) Solve simultaneous equations: Equation 1 = Equation 2 NCSP Chapter 4 Solutions 6
7 T = a = 0.8a 9.8 = 1.8 a a = 5.44 m s -2 T = 0.8 x 5.44 = 4.45 N Question 21 p99 FA = 220 N Ff = 220 N FW = mg = = 392 N FN = FW = 392 n = Ff/FN = 220/392 = 0.56 Question 22 p99 FW = mg = = N [Note: 1 tonne = 1000 kg] FN = FW = N Ff = FN = = N FH = Ff = N Question 23 p 100 (a) FA = 350 N FH = FA cos = 350 cos 38 = N Ff = N (b) FW = mg = = 784 N FV = FA sin = 350 sin 38 = N FN = FW FV = = N (c) = Ff/FN = 275.8/568.5 = Question 24 Ff = FN FA cos = FN FA cos 40 = (FW + FA sin ) FA = 0.12 ( FA sin 40 ) FA = FA FA = NCSP Chapter 4 Solutions 7
8 FA = N Question 27 Fnet = Fdown - Fup ma = mg sin - µ mg cos a = g sin - µ g cos a = 9.8 sin cos13.8 a = a = 4.61 m s -2 Kinematics formula: u 2 = 2as u 2 = u = m s -1 Question 31 p 104 (a) ( )N - 18S = 25 N north; (b) ( )U - 6.5D = 10.1 N up; (c) By Pythagoras Theorem: FR = ( ) = 36.4 N; = tan -1 (10/35) = W16 S, or S74 W. (d) Pythagoras: ( ) = 1.8 N; = tan -1 (1.5/1) = W56 N. NCSP Chapter 4 Solutions 8
9 Question 32 p 104 Volume = l b d = 25 x = m 3 m = density V = = kg (202.5 g) Question 33 p104 (a) 1 st (you want to continue at your current speed but the car accelerates and presses on your back); (b) 3 rd (the water spurting out causes an equal and opposite reaction); (c) 2 nd (the force acting on it is constant and so is its mass, so by Newton s 2 nd law: a = F/m = constant; (d) 1st (the object was in a constant state of motion (at rest) but when acted on by an unbalanced force it accelerates in the direction of the unbalanced force which is down). Question 35 (a) F = ma = = N east; (b) a = (v -u)/t = (2-0)/3 = 0.67 m s -2 ; F = ma = = N (c) m = F/g = 25/9.8 = 2.55 kg; F = ma = = 25 N (d) v 2 = u as; 5 2 = a 4.0; a = 25/8 = m s -2 ; F = ma = = N (e) a = (v u)/t = (60 40)/( ) = 4000 m s -2 ; F = ma = = N Question 41 (a) 3rd law Throw your jacket off behind you to accelerate; (b) 2nd law The faster you throw, the greater the acceleration; (c) 1st law To change direction, throw something to the side Question 42 Rolling and sliding friction is independent of area. Starting (static) friction varies with area. Question 43 High friction is more important. The rubber compounds in the tyres are selected to perform within a specific temperature range. When too cold, less grip means spins or having to travel slower on corners. Travelling slower is a problem for grip as the car aerodynamics are such that they can only effectively corner at higher speed (pressed onto the tarmac). Question 44 (a) NCSP Chapter 4 Solutions 9
10 (b) F = ma; m = F/a = 1/gradient = 1/0.3 = 3.3 kg (c) Line would cut x axis at somewhere greater than zero. Figure For question 76. Question 45 (a) mass added (kg) mass of trolley (kg) total mass (kg) t (s) a= 2s/t 2 (m s -2 ) F = ma (N) (b) 0.25 m s 2, 0.18 m s 2, 0.15 m s 2 ; NCSP Chapter 4 Solutions 10
11 (c) (d) m 1/a; (e) N in each case; (f) (i) about m s 2 from the graph; a = F/m = 0.175/1.3 = m s -2 (ii) s = ½ at 2 ; t 2 = 2s/a = 1/0.134 = 7.46; t = 2.73 s (g) The force from the rubber bands would have to be constant. Question 46 (a) combustion 60%, engine 21.4%, transmission 1.6%, accessories 2.2%, tyres 5.2%, air 4.9%, brakes 4.7%; (b) decrease i, ii, v, vi, vii; increase iii, iv Question 47 Steel plate drags along ground. Loss of control; dig up road Question 52 s = 290 m; = 0.60 Ff = FN = m mg Ff = ma a = Ff/m = mg/m = g = = 6 ms -2 v 2 = u 2 +2as 0 = u u = 59 ms -1 (212 km h -1 ) Question 53 Basic relationships: FH = Ff = FAcos ; FN = FW FA sin Ff = FN Ff = (FW FAsin ) FAcos = (FW - FAsin ) FA 0.74 = 0.1(750 FA 0.67) FA = 75 FA = 93 N NCSP Chapter 4 Solutions 11
12 Question 54 u = 20 m s -1 ; F = ; s = 22.0 m a = F/m = 6 x 10 3 /1500 = 4.0 ms -2 v 2 = u 2 + 2as = v 2 = v = 15 m s -1 Question 55 Convert 60 km h -1 to m s -1 = 16.7 m s -1 At terminal velocity FW = ½ C A v 2 ½ C A1 v1 2 = ½ C A2 v2 2 cancelling ½ C from both sides A1 v1 2 = A2 v2 2 A1 v1 2 = 2A1 v2 2 (replacing A2 with 2A1) v1 2 = 2 v = 2 v = 2 v2 2 v2 = 11.7 ms -1 Question 56 u = m s 1 ; FUP = N; FW = N FNET = FUP FW FNET = N N = N a = F/m = / = m s 2 t = s/v = / = seconds s (up) = ut + ½ at 2 = 0 + ½ ( ) 2 = m (15.3 cm) Question km h -1 = 30000/3600 = 8.33 m s -1 a1 = µg = = m s -2 a2 = µg = = m s -2 STAGE 2: v 2 = vmid 2 + 2as = vmid x = vmid 2 vmid = 10.4 m s -1 STAGE 1: vmid 2 = u 2 + 2as = u NCSP Chapter 4 Solutions 12
13 u 2 = u = 15.2 m s -1 NCSP Chapter 4 Solutions 13
Forces. Unit 2. Why are forces important? In this Unit, you will learn: Key words. Previously PHYSICS 219
Previously Remember From Page 218 Forces are pushes and pulls that can move or squash objects. An object s speed is the distance it travels every second; if its speed increases, it is accelerating. Unit
More informationChapter: Motion, Acceleration, and Forces
Chapter 3 Table of Contents Chapter: Motion, Acceleration, and Forces Section 1: Describing Motion Section 2: Acceleration Section 3: Motion and Forces 1 Motion Describing Motion Distance and time are
More informationPYP 001 FIRST MAJOR EXAM CODE: TERM: 151 SATURDAY, OCTOBER 17, 2015 PAGE: 1
TERM: 151 SATURDAY, OCTOBER 17, 2015 PAGE: 1 *Read the following (20) questions and choose the right answer: 1 The figure below represents the speed-time graph for the motion of a vehicle during a 7.0-minute
More information9/27/12. Chapter: Motion, Acceleration, and Forces. Motion and Position. Motion. Distance. Relative Motion
9/7/ Table of Contents Chapter: Motion,, and Forces Section : Chapter Section : Section : Motion Distance and time are important. In order to win a race, you must cover the distance in the shortest amount
More informationNEWTON S LAWS OF MOTION
Book page 44-47 NETON S LAS OF MOTION INERTIA Moving objects have inertia a property of all objects to resist a change in motion Mass: a measure of a body s inertia Two types of mass: - inertial mass m
More information1. A sphere with a radius of 1.7 cm has a volume of: A) m 3 B) m 3 C) m 3 D) 0.11 m 3 E) 21 m 3
1. A sphere with a radius of 1.7 cm has a volume of: A) 2.1 10 5 m 3 B) 9.1 10 4 m 3 C) 3.6 10 3 m 3 D) 0.11 m 3 E) 21 m 3 2. A 25-N crate slides down a frictionless incline that is 25 above the horizontal.
More informationChapter 6 Dynamics I: Motion Along a Line
Chapter 6 Dynamics I: Motion Along a Line Chapter Goal: To learn how to solve linear force-and-motion problems. Slide 6-2 Chapter 6 Preview Slide 6-3 Chapter 6 Preview Slide 6-4 Chapter 6 Preview Slide
More informationYear 11 Physics Tutorial 84C2 Newton s Laws of Motion
Year 11 Physics Tutorial 84C2 Newton s Laws of Motion Module Topic 8.4 Moving About 8.4.C Forces Name Date Set 1 Calculating net force 1 A trolley was moved to the right by a force applied to a cord attached
More informationUniversity Physics (Prof. David Flory) Chapt_06 Saturday, October 06, 2007 Page 1
University Physics (Prof. David Flory) Chapt_06 Saturday, October 06, 2007 Page 1 Name: Date: 1. A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction
More informationForce, Friction & Gravity Notes
Force, Friction & Gravity Notes Key Terms to Know Speed: The distance traveled by an object within a certain amount of time. Speed = distance/time Velocity: Speed in a given direction Acceleration: The
More informationHSC PHYSICS ONLINE B F BA. repulsion between two negatively charged objects. attraction between a negative charge and a positive charge
HSC PHYSICS ONLINE DYNAMICS TYPES O ORCES Electrostatic force (force mediated by a field - long range: action at a distance) the attractive or repulsion between two stationary charged objects. AB A B BA
More informationChapter: Newton s Laws of Motion
Table of Contents Chapter: Newton s Laws of Motion Section 1: Motion Section 2: Newton s First Law Section 3: Newton s Second Law Section 4: Newton s Third Law 1 Motion What is motion? Distance and Displacement
More informationChapter: The Laws of Motion
Table of Contents Chapter: The Laws of Motion Section 1: Newton s Second Law Section 2: Gravity Section 3: The Third Law of Motion 1 Newton s Second Law Force, Mass, and Acceleration Newton s first law
More informationChapter 4. Answer Key. Physics Lab Sample Data. Mini Lab Worksheet. Tug-of-War Challenge. b. Since the rocket takes off from the ground, d i
Chapter 3 continued b. Since the rocket takes off from the ground, d i 0.0 m, and at its highest point, v f 0.0 m/s. v f v i a t f (d f d i ) 0 v i a t f d f v i d f a t f (450 m/s) ( 9.80 m/s )(4.6 s)
More informationTopic: Force PHYSICS 231
Topic: Force PHYSICS 231 Current Assignments Homework Set 2 due this Thursday, Jan 27, 11 pm Reading for next week: Chapters 10.1-6,10.10,8.3 2/1/11 Physics 231 Spring 2011 2 Key Concepts: Force Free body
More informationChapter 3, Section 3
Chapter 3, Section 3 3 What is force? Motion and Forces A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable. What Is a Force? A force......
More information7.2. Assessment in Diploma Program Physics 281
7.2. Assessment in Diploma Program Physics 281 figures in 100 kmh 1, we round the answer to two significant figures. Note that we have to use at least one significant figure more than the final result
More informationUnit 6 Forces and Pressure
Unit 6 Forces and Pressure Lesson Objectives: Mass and weight Gravitational field and field strength describe the effect of balanced and unbalanced forces on a body describe the ways in which a force may
More informationNewton. Galileo THE LAW OF INERTIA REVIEW
Galileo Newton THE LAW OF INERTIA REVIEW 1 MOTION IS RELATIVE We are moving 0 m/s and 30km/s Find the resultant velocities MOTION IS RELATIVE Position versus Time Graph. Explain how the car is moving.
More informationYanbu University College. General Studies Department. Phsc001 Course (111) Chapter2 (forces) Worksheet Solutions
1 Yanbu University College General Studies Department Phsc001 Course (111) Chapter2 (forces) Worksheet Solutions 2 Chapter 2 Worksheet Part 1 Matching: Match the definitions with the given concepts. 1.
More informationReview 3: Forces. 1. Which graph best represents the motion of an object in equilibrium? A) B) C) D)
1. Which graph best represents the motion of an object in equilibrium? A) B) C) D) 2. A rock is thrown straight up into the air. At the highest point of the rock's path, the magnitude of the net force
More informationVersion PREVIEW Semester 1 Review Slade (22222) 1
Version PREVIEW Semester 1 Review Slade () 1 This print-out should have 48 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Holt SF 0Rev 10A
More informationWiley Plus. Final Assignment (5) Is Due Today: Before 11 pm!
Wiley Plus Final Assignment (5) Is Due Today: Before 11 pm! Final Exam Review December 9, 009 3 What about vector subtraction? Suppose you are given the vector relation A B C RULE: The resultant vector
More informationWS-CH-4 Motion and Force Show all your work and equations used. Isaac Newton ( )
AP PHYSICS 1 WS-CH-4 Motion and Force Show all your work and equations used. Isaac Newton (1643-1727) Isaac Newton was the greatest English mathematician of his generation. He laid the foundation for differential
More informationChapter 4 Newton s Laws
Chapter 4 Newton s Laws Isaac Newton 1642-1727 Some inventions and discoveries: 3 laws of motion Universal law of gravity Calculus Ideas on: Sound Light Thermodynamics Reflecting telescope In this chapter,
More informationG r a d e 1 1 P h y s i c s ( 3 0 s ) Midterm Practice exam
G r a d e 1 1 P h y s i c s ( 3 0 s ) Midterm Practice exam G r a d e 1 1 P h y s i c s ( 3 0 s ) Midterm Practice Exam Instructions The final exam will be weighted as follows: Modules 1 6 100% The format
More informationPhysics 100 Reminder: for on-line lectures
Physics 100 Reminder: http://www.hunter.cuny.edu/physics/courses/physics100/fall-2016 for on-line lectures Today: Finish Chapter 3 Chap 4 - Newton s Second Law In Chapter 4, we establish a relationship
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) You are standing in a moving bus, facing forward, and you suddenly fall forward as the
More informationPHYS 101 Previous Exam Problems. Force & Motion I
PHYS 101 Previous Exam Problems CHAPTER 5 Force & Motion I Newton s Laws Vertical motion Horizontal motion Mixed forces Contact forces Inclines General problems 1. A 5.0-kg block is lowered with a downward
More informationForces I. Newtons Laws
Forces I Newtons Laws Kinematics The study of how objects move Dynamics The study of why objects move Newton s Laws and Forces What is force? What are they? Force A push or a pull Symbol is F Unit is N
More informationVISUAL PHYSICS ONLINE DYNAMICS TYPES OF FORCES FRICTION
VISUAL PHYSICS ONLINE DYNAMICS TYPES OF FORCES FRICTION Friction force: the force acting on the object which acts in a direction parallel to the surface. A simple model for friction F f is that it is proportional
More information3. The diagram shows two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart.
1. Which statement describes the gravitational force and the electrostatic force between two charged particles? A) The gravitational force may be either attractive or repulsive, whereas the electrostatic
More informationPhysics Midterm Review Sheet
Practice Problems Physics Midterm Review Sheet 2012 2013 Aswers 1 Speed is: a a measure of how fast something is moving b the distance covered per unit time c always measured in units of distance divided
More informationPhysics 4A Chapter 5: Force and Motion and Chapter 6: Dynamics I: Motion Along a Line
Physics 4A Chapter 5: Force and Motion and Chapter 6: Dynamics I: Motion Along a Line Conceptual Questions and Example Problems from Chapters 5 and 6 Conceptual Question 5.7 An object experiencing a constant
More informationMarr College Science. Forces. Learning Outcomes and Summary Notes
Marr College Science Forces Learning Outcomes and Summary Notes Learning Intentions By the end of this unit I will be able to 1. Describe a force as a push or a pull. 2. Describe the effects of forces
More information5. A balloon of a known mass or weight is dropped from a known height and timed. Determine the average amount of air resistance that acts on it.
1. A satellite of mass 50.0 kg is pulled by 450 N of gravity. Small thrusters are used to maneuver the satellite in its orbit. (a) What thrust would cause the satellite to move with a constant velocity?
More informationWORK, ENERGY AND POWER P.1
WORK, ENERGY AND OWER.1 HKCEE AER I 11 11 Figure 6 shows an experimental setup, which is used to find the friction between a block and a table. A weight is connected to the block through a frictionless
More informationEvery object remains in a state of rest or move with constant velocity in a straight line unless forces acts on it to change that state
" NEWONʼS LAW OF MOION NEWONʼS FIRS LAW Newtonʼs First Law of Motion states that: Every object remains in a state of rest or move with constant velocity in a straight line unless forces acts on it to change
More informationSPS8. STUDENTS WILL DETERMINE RELATIONSHIPS AMONG FORCE, MASS, AND MOTION.
MOTION & FORCES SPS8. STUDENTS WILL DETERMINE RELATIONSHIPS AMONG FORCE, MASS, AND MOTION. A. CALCULATE VELOCITY AND ACCELERATION. B. APPLY NEWTON S THREE LAWS TO EVERYDAY SITUATIONS BY EXPLAINING THE
More informationNewton s 3 Laws of Motion
Newton s 3 Laws of Motion 1. If F = 0 No change in motion 2. = ma Change in motion Fnet 3. F = F 1 on 2 2 on 1 Newton s First Law (Law of Inertia) An object will remain at rest or in a constant state of
More informationChapter 05 Test A. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.
Class: Date: Chapter 05 Test A Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The SI unit of force preferred by scientists is the: a. kilogram. b. newton.
More informationChapter 4. Forces in One Dimension
Chapter 4 Forces in One Dimension Chapter 4 Forces in One Dimension In this chapter you will: *VD Note Use Newton s laws to solve problems. Determine the magnitude and direction of the net force that causes
More informationChapter 6. Preview. Section 1 Gravity and Motion. Section 2 Newton s Laws of Motion. Section 3 Momentum. Forces and Motion.
Forces and Motion Preview Section 1 Gravity and Motion Section 2 Newton s Laws of Motion Section 3 Momentum Concept Mapping Section 1 Gravity and Motion Bellringer Answer the following question in your
More informationDynamics Multiple Choice Homework
Dynamics Multiple Choice Homework PSI Physics Name 1. In the absence of a net force, a moving object will A. slow down and eventually stop B. stop immediately C. turn right D. move with constant velocity
More informationName: Unit 4 Newton s 1 st & 3 rd Law
Name: Period: Table #: Unit 4 Newton s 1 st & 3 rd Law 1 UNIT IV: Reading - Force Diagrams The analysis of a problem in dynamics usually involves the selection and analysis of the relevant forces acting
More informationInertia and Mass. 7. Mass and velocity values for a variety of objects are listed below. Rank the objects from smallest to greatest inertia.
Inertia and Mass Read from Lesson 1 of the Newton's Laws chapter at The Physics Classroom: http://www.physicsclassroom.com/class/newtlaws/u2l1a.html http://www.physicsclassroom.com/class/newtlaws/u2l1b.html
More informationForces & NEWTON S LAWS HOMEWORK
1 Forces & NEWTON S LAWS HOMEWORK BASIC CONCEPTS OF MASS VS. WEIGHT VS. VOLUME VS. DENSITY MULTIPLE CHOICE: You have one kilogram of feathers and one kilogram of lead. Which has more: 1. mass? 3. weight?
More informationFour naturally occuring forces
Forces System vs Environment: system the object the force is applied to environment the world around the object that exerts the force Type Forces: Contact is applied by touching Long range exerted without
More informationLecture 4. Newton s 3rd law and Friction
Lecture 4 Newton s 3rd law and Friction Newtons First Law or Law of Inertia If no net external force is applied to an object, its velocity will remain constant ("inert"). OR A body cannot change its state
More information1. A train moves at a constant velocity of 90 km/h. How far will it move in 0.25 h? A. 10 km B km C. 25 km D. 45 km E. 50 km
Name: Physics I Mid Term Exam Review Multiple Choice Questions Date: Mr. Tiesler 1. A train moves at a constant velocity of 90 km/h. How far will it move in 0.25 h? A. 10 km B. 22.5 km C. 25 km D. 45 km
More informationPhysics Pre-comp diagnostic Answers
Name Element Physics Pre-comp diagnostic Answers Grade 8 2017-2018 Instructions: THIS TEST IS NOT FOR A GRADE. It is to help you determine what you need to study for the precomps. Just do your best. Put
More informationWhat is force? A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable.
Chapter 3, Sec-on 3 3 What is force? Motion and Forces A force is a push or pull. Sometimes it is obvious that a force has been applied. But other forces aren t as noticeable. What Is a Force? A force......
More information8. The graph below shows a beetle s movement along a plant stem.
Name: Block: Date: Introductory Physics: Midyear Review 1. Motion and Forces Central Concept: Newton s laws of motion and gravitation describe and predict the motion of most objects. 1.1 Compare and contrast
More informationAugust 05, Chapter 4 - Dynamics - WHY things move Newton has THREE laws of motion
Chapter 4 - Dynamics - WHY things move Newton has THREE laws of motion 1st Law Law of Inertia - An object in CONSTANT motion remains in CONSTANT motion and an object at rest remains at rest UNLESS acted
More informationMOTION & FORCES. Observing Motion. Speed and Velocity. Distance vs. Displacement CHAPTERS 11 & 12
Observing Motion CHAPTERS 11 & 12 MOTION & FORCES Everything surrounding us is in motion, but it is relative to other object that remain in place. Motion is observed using a frame of reference. Motion
More informationThere are two main types of friction:
Section 4.15: Friction Friction is needed to move. Without friction, a car would sit in one spot spinning its tires, and a person would not be able to step forward. However, the motion of an object along
More information1. The diagram below shows the variation with time t of the velocity v of an object.
1. The diagram below shows the variation with time t of the velocity v of an object. The area between the line of the graph and the time-axis represents A. the average velocity of the object. B. the displacement
More informationPhysics 100. Today. Finish Chapter 4: Newton s Second Law. Start Chapter 5: Newton s Third Law
Physics 100 Today Finish Chapter 4: Newton s Second Law Start Chapter 5: Newton s Third Law First, let s clarify notion of a force: Previously defined force as a push or pull. Better to think of force
More informationForces. Brought to you by:
Forces Brought to you by: Objects have force because of their mass and inertia Mass is a measure of the amount of matter/particles in a substance. Mass is traditionally measured with a balance. Inertia
More informationSummary of Chapters 1-3. Equations of motion for a uniformly accelerating object. Quiz to follow
Summary of Chapters 1-3 Equations of motion for a uniformly accelerating object Quiz to follow An unbalanced force acting on an object results in its acceleration Accelerated motion in time, t, described
More informationPHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc.
PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 5 Lecture RANDALL D. KNIGHT Chapter 5 Force and Motion IN THIS CHAPTER, you will learn about the connection between force and motion.
More informationChapter 2. Forces & Newton s Laws
Chapter 2 Forces & Newton s Laws 1st thing you need to know Everything from chapter 1 Speed formula Acceleration formula All their units There is only 1 main formula, but some equations will utilize previous
More informationFriction. Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist.
Friction Friction is a force that resists the motion of objects or surfaces. Many kinds of friction exist. Friction Friction depends on both of the surfaces in contact. When the hockey puck slides on
More information1 In the absence of a net force, a moving object will. slow down and eventually stop stop immediately turn right move with constant velocity turn left
Slide 1 / 51 1 In the absence of a net force, a moving object will slow down and eventually stop stop immediately turn right move with constant velocity turn left Slide 2 / 51 2 When a cat sleeps on a
More informationLAWS OF MOTION Newtons laws of motion. (i) First law: Law of inertia. Every body continues to be in its state of rest or of uniform motion in a
LAWS OF MOTION Newtons laws of motion. (i) First law: Law of inertia. Every body continues to be in its state of rest or of uniform motion in a straight line unless compelled to change that state by an
More informationAn object moves back and forth, as shown in the position-time graph. At which points is the velocity positive?
1 The slope of the tangent on a position-time graph equals the instantaneous velocity 2 The area under the curve on a velocity-time graph equals the: displacement from the original position to its position
More informationQ2. A book whose mass is 2 kg rests on a table. Find the magnitude of the force exerted by the table on the book.
AP Physics 1- Dynamics Practice Problems FACT: Inertia is the tendency of an object to resist a change in state of motion. A change in state of motion means a change in an object s velocity, therefore
More informationChapter 4: Newton's Second Law of Motion
Lecture Outline Chapter 4: Newton's Second Law of Motion This lecture will help you understand: Force Causes Acceleration Friction Mass and Weight Newton's Second Law of Motion Free Fall Nonfree Fall Force
More informationBroughton High School of Wake County
Name: Section: 1 Section 1: Which picture describes Newton s Laws of Motion? 5. Newton s Law 1. Newton s Law 2. Newton s Law 6. Newton s Law 3. Newton s Law 7. Newton s Law 4. Newton s Law 8. Newton s
More informationA) more mass and more inertia C) the same as the magnitude of the rock's weight C) a man standing still on a bathroom scale
1. A 15-kilogram cart is at rest on a horizontal surface. A 5-kilogram box is placed in the cart. Compared to the mass and inertia of the cart, the cart-box system has A) more mass and more inertia B)
More informationChapter 4. Forces and Newton s Laws of Motion
Chapter 4 Forces and Newton s Laws of Motion Chapter 4: Forces and Newton s Laws Force, mass and Newton s three laws of motion Newton s law of gravity Normal, friction and tension forces Apparent weight,
More informationSolution of HW4. and m 2
Solution of HW4 9. REASONING AND SOLUION he magnitude of the gravitational force between any two of the particles is given by Newton's law of universal gravitation: F = Gm 1 m / r where m 1 and m are the
More informationPHYSICS. Hence the velocity of the balloon as seen from the car is m/s towards NW.
PHYSICS. A balloon is moving horizontally in air with speed of 5 m/s towards north. A car is moving with 5 m/s towards east. If a person sitting inside the car sees the balloon, the velocity of the balloon
More information66 Chapter 6: FORCE AND MOTION II
Chapter 6: FORCE AND MOTION II 1 A brick slides on a horizontal surface Which of the following will increase the magnitude of the frictional force on it? A Putting a second brick on top B Decreasing the
More information3/10/2019. What Is a Force? What Is a Force? Tactics: Drawing Force Vectors
What Is a Force? A force acts on an object. A force requires an agent, something that acts on the object. If you throw a ball, your hand is the agent or cause of the force exerted on the ball. A force
More informationPHYSICS 231 Laws of motion PHY 231
PHYSICS 231 Laws of motion 1 Newton s Laws First Law: If the net force exerted on an object is zero the object continues in its original state of motion; if it was at rest, it remains at rest. If it was
More informationForce - a push or a pull A force described by its strength and by the direction in which it acts The SI unit for force is the newton (N)
Forces Force - a push or a pull A force described by its strength and by the direction in which it acts The SI unit for force is the newton (N) The direction and strength of forces can be represented by
More informationNEWTON S LAWS OF MOTION
NAME SCHOOL INDEX NUMBER DATE NEWTON S LAWS OF MOTION 1. 1995 Q21 P1 State Newton s first law of motion (1 mark) 2. 1998 Q22 P1 A body of mass M is allowed to slide down an inclined plane. State two factors
More informationA scalar quantity has just magnitude A vector quantity has both magnitude and direction
Name Date Mods REVIEW FOR MIDYEAR ASSESSMENT 1. Physics is the most basic science because Physics supports chemistry, chemistry supports biology. The ideas of physics are fundamental to these more complicated
More informationCh 6 Using Newton s Laws. Applications to mass, weight, friction, air resistance, and periodic motion
Ch 6 Using Newton s Laws Applications to mass, weight, friction, air resistance, and periodic motion Newton s 2 nd Law Applied Galileo hypothesized that all objects gain speed at the same rate (have the
More informationMechanics II. Which of the following relations among the forces W, k, N, and F must be true?
Mechanics II 1. By applying a force F on a block, a person pulls a block along a rough surface at constant velocity v (see Figure below; directions, but not necessarily magnitudes, are indicated). Which
More informationThomas Whitham Sixth Form Mechanics in Mathematics
Thomas Whitham Sixth Form Mechanics in Mathematics 6/0/00 Unit M Rectilinear motion with constant acceleration Vertical motion under gravity Particle Dynamics Statics . Rectilinear motion with constant
More informationFigure 5.1a, b IDENTIFY: Apply to the car. EXECUTE: gives.. EVALUATE: The force required is less than the weight of the car by the factor.
51 IDENTIFY: for each object Apply to each weight and to the pulley SET UP: Take upward The pulley has negligible mass Let be the tension in the rope and let be the tension in the chain EXECUTE: (a) The
More informationChapter 4 Force and Motion
Chapter 4 Force and Motion Units of Chapter 4 The Concepts of Force and Net Force Inertia and Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion More on Newton s Laws:
More informationPhysics 1A, Week 2 Quiz Solutions
Vector _ A points north and vector _ B points east. If _ C = _ B _ A, then vector _C points: a. north of east. b. south of east. c. north of west. d. south of west. Find the resultant of the following
More information4 Study Guide. Forces in One Dimension Vocabulary Review
Date Period Name CHAPTER 4 Study Guide Forces in One Dimension Vocabulary Review Write the term that correctly completes the statement. Use each term once. agent force Newton s second law apparent weight
More informationWhat Is a Force? Slide Pearson Education, Inc.
What Is a Force? A force acts on an object. A force requires an agent, something that acts on the object. If you throw a ball, your hand is the agent or cause of the force exerted on the ball. A force
More informationPre Comp Review Questions 7 th Grade
Pre Comp Review Questions 7 th Grade Section 1 Units 1. Fill in the missing SI and English Units Measurement SI Unit SI Symbol English Unit English Symbol Time second s second s. Temperature Kelvin K Fahrenheit
More informationTwentieth SLAPT Physics Contest Southern Illinois University Edwardsville April 30, Mechanics Test
Twentieth SLAPT Physics Contest Southern Illinois University Edwardsville April 30, 2005 Mechanics Test Please answer the following questions on the supplied answer sheet. You may write on this test booklet,
More informationPHYSICS. Chapter 5 Lecture FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E RANDALL D. KNIGHT Pearson Education, Inc.
PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 5 Lecture RANDALL D. KNIGHT Chapter 5 Force and Motion IN THIS CHAPTER, you will learn about the connection between force and motion.
More informationPractice Honors Physics Test: Newtons Laws
Name: Class: Date: Practice Honors Physics Test: Newtons Laws Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Acceleration is defined as the CHANGE in
More information4 Newton s Second Law of Motion
4 Newton s Second Law of Motion Answers and Solutions for Chapter 4 Reading Check Questions 1. Acceleration and net force are proportional to each other, not equal to each other. 2. Your push and the force
More informationPhysics 12 Unit 2: Vector Dynamics
1 Physics 12 Unit 2: Vector Dynamics In this unit you will extend your study of forces. In particular, we will examine force as a vector quantity; this will involve solving problems where forces must be
More informationTopic 2.1: Kinematics. How do we analyze the motion of objects?
Topic.1: Kinematics How do we analyze the motion of objects? Characteristic Graphs The most common kinematics problems involve uniform acceleration from rest These have a characteristic shape for each
More informationDynamics Notes.notebook October 22, 2018
Dynamics 1 Kinematics Description of how objects move (what we just finished) Dynamics Description of why objects move Connection between force and motion Newton's Laws of Motion Force something capable
More informationNewton s Laws of Motion
Newton's Laws of Motion The British scientist Sir Isaac Newton (164 177) was able to state rules that describe the effects of forces on the motion of objects. These rules are known as Newton's law's of
More informationUnit 4 Forces (Newton s Laws)
Name: Pd: Date: Unit Forces (Newton s Laws) The Nature of Forces force A push or pull exerted on an object. newton A unit of measure that equals the force required to accelerate kilogram of mass at meter
More information9/20/11. Physics 101 Tuesday 9/20/11 Class 8" Chapter " Weight and Normal forces" Frictional Forces"
Reading Quiz Physics 101 Tuesday 9/20/11 Class 8" Chapter 5.6 6.1" Weight and Normal forces" Frictional Forces" The force due to kinetic friction is usually larger than the force due to static friction.
More informationIsaac Newton. What is a force? Newton s Three Laws of Motion. What is the acceleration of the car?
Aim: What did Isaac Newton teach us about motion? Do Now: 1. A 2009 Ford Mustang convertible is travelling at constant velocity on Interstate 95 south from Philadelphia to Wilmington Delaware. It passes
More informationConceptual Physics Fundamentals. Chapter 3: EQUILIBRIUM AND LINEAR MOTION
Conceptual Physics Fundamentals Chapter 3: EQUILIBRIUM AND LINEAR MOTION This lecture will help you understand: Aristotle on Motion Galileo s Concept of Inertia Mass A Measure of Inertia Net Force The
More information