# Questions and Problems

Size: px
Start display at page:

Transcription

2 190 Chapter 5 orces and otion II: Applications 21. A block of mass m slides down a rough incline with constant speed. If a similar block that has a mass of 4m were placed on the same incline, it would A. slide down at constant speed. B. accelerate down the incline. C. slowly slide down the incline and then stop. D. accelerate down the incline with an acceleration four times greater than that of the smaller block. E. not move. SS 22. A 10-kg crate is placed on a horizontal conveyor belt moving with a constant speed. The crate does not slip. If the coefficients of friction between the crate and the belt are m s equal to 0.50 and m k equal to 0.30, what is the frictional force exerted on the crate? A. 98 N B. 49 N C. 29 N D. 9.8 N E Biology The Escherichia coli (E. coli) bacterium propels itself through water by means of long, thin structures called flagella. If the force exerted by the flagella doubles, the velocity of the bacterium A. doubles. B. decreases by half. C. does not change. D. increases by a factor of four. E. cannot be determined without more information. 24. A 1-kg wood ball and a 5-kg lead ball have identical sizes, shapes, and surface characteristics. They are dropped simultaneously from a tall tower. Air resistance is present. How do their accelerations compare? A. The 1-kg wood ball has the larger acceleration. B. The 5-kg lead ball has the larger acceleration. C. The accelerations are the same. D. The 5-kg ball accelerates at five times the acceleration of the 1-kg ball. E. The 1-kg ball accelerates at five times the acceleration of the 5-kg ball. 25. A skydiver is falling at his terminal speed. Immediately after he opens his parachute A. his speed will be larger than his terminal speed. B. the drag force on the skydiver will decrease. C. the net force on the skydiver is in the downward direction. D. the drag force is larger than the skydiver s weight. E. the net force on the skydiver is zero. SS 26. Two rocks that are of equal mass are tied to massless strings and whirled in nearly horizontal circles at the same speed. One string is twice as long as the other. What is the tension T 1 in the shorter string compared to the tension T 2 in the longer one? A. T 1 = 14T 2 B. T 1 = 12T 2 C. T 1 = T 2 D. T 1 = 2T 2 E. T 1 = 4T You are on a erris wheel moving in a vertical circle. When you are at the bottom of the circle, how does the magnitude of the normal force N exerted by your seat compare to your weight mg? A. N = mg B. N 7 mg C. N 6 mg D. N = 12mg E. N = 2mg SS 28. Two rocks are tied to massless strings and whirled in nearly horizontal circles so that the period of motion is the same for both. One string is twice as long as the other. The tension in the longer string is twice the tension in the shorter one. What is the mass m 1 of the rock at the end of the shorter string compared to the mass m 2 of the rock at the end of the longer one? A. m 1 = 14m 2 B. m 1 = 12m 2 C. m 1 = m 2 D. m 1 = 2m 2 E. m 1 = 4m 2 Estimation/Numerical Analysis 29. Estimate the numerical value of the coefficient of static friction between a car s tires and dry pavement. 30. Estimate the value of the coefficient of kinetic friction for a box of books on a carpeted floor. 31. Sports ake a rough estimate of the value of the coefficient of kinetic friction between a baseball player s uniform and the infield surface as he slides into second base. SS 32. Give a numerical estimate of the minimum radius of curvature of an unbanked on-ramp for a typical freeway. 33. Sports Estimate the size of the coefficient of kinetic friction between a hockey puck and the ice of a rink. 34. (a) Estimate the magnitude of the coefficient of kinetic friction of a book as it slides across a tabletop. (b) Estimate the magnitude of the coefficient of static friction for the same book on the same tabletop. 35. Estimate the magnitude of the coefficient of kinetic friction between you and the surface of a waterslide. SS 36. Estimate the magnitude of the coefficient of kinetic friction for a mug of root beer as it slides across a wooden bar. 37. The following table lists the forces applied to a 1.00-kg t (s) (N) t (s) (N) crate at particular times. The crate begins at rest on a rough, horizontal surface but is then pushed with a constant force in the horizontal direction. Using the data, estimate the coefficient of static friction and the coefficient of kinetic friction between the crate and the surface. Problems 5-2 The static friction force changes magnitude to offset other applied forces 38. What is the minimum horizontal force that will cause a 5.00-kg box to begin to slide on a horizontal surface when the coefficient of static friction is 0.670? reed_c05_ hr1.indd 190 8/28/12 6:24 P

3 Questions and Problems A 7.60-kg object rests on a level floor with a coefficient of static friction of What minimum horizontal force will cause the object to start sliding? SS 40. Draw a free-body diagram for the situation shown in igure An object of mass rests on a ramp; there is friction between the object and the ramp. The system is in equilibrium. cause the object to accelerate at 2.50 m>s 2? The force is applied at an angle of u = 30.0 (igure 5-25). riction µ k θ =? igure 5-25 Problem 46 igure 5-22 Problem The kinetic friction force on a sliding object has a constant magnitude 41. A book is pushed across a horizontal table at a constant speed. If the horizontal force applied to the book is equal to one-half of the book s weight, calculate the coefficient of kinetic friction between the book and the tabletop. SS 42. An object on a level surface experiences a horizontal force of 12.7 N due to kinetic friction. If the coefficient of kinetic friction is 0.37, what is the mass of the object? 43. A 25.0-kg crate rests on a level floor. A horizontal force of 50.0 N accelerates the crate at 1.00 m>s 2. Calculate (a) the normal force on the crate, (b) the frictional force on the crate, and (c) the coefficient of kinetic friction between the crate and the floor. 44. A block of mass rests on a block of mass 1 = 5.00 kg which is on a tabletop (igure 5-23). A light string passes over a frictionless peg and connects the blocks. The coefficient of kinetic friction m k at both surfaces equals A force of 60.0 N pulls the upper block to the left and the lower block to the right. The blocks are moving at a constant speed. Determine the mass of the upper block. 5-4 Problems involving static and kinetic friction are like any other problem with forces 47. A taut string connects a crate with mass 1 = 5.00 kg to a crate with mass 2 = 12.0 kg (igure 5-26). The coefficient of static friction between the smaller crate and the floor is 0.573; the coefficient of static friction between the larger crate and the floor is What is the minimum horizontal force required to start the crates in motion? SS 2 1 igure 5-26 Problem A box of mass box = 2.00 kg rests on top of a crate with mass crate = 5.00 kg (igure 5-27). The coefficient of static friction between the box and the crate is The coefficient of static friction between the crate and the floor is Calculate the minimum force that is required to move the crate to the right and the corresponding tension T in the rope that connects the box to the wall when the crate is moved. T Box 1 igure 5-23 Problem A mop is pushed across the floor with a force of 50.0 N at an angle of u = 50.0 (igure 5-24). The mass of the mop head is 3.75 kg. Calculate the acceleration of the mop head if the coefficient of kinetic friction between the head and the floor is igure 5-27 Problem 48 Crate 49. Two blocks are connected over a massless, frictionless pulley (igure 5-28). The mass of block 2 is 8.00 kg, and the coefficient of kinetic friction between block 2 and the incline is The angle u of the incline is Block 2 slides down the incline at constant speed. What is the mass of block 1? SS u µ k igure 5-24 Problem If the coefficient of kinetic friction between an object with mass = 3.00 kg and a flat surface is 0.400, what force will 1 2 riction q igure 5-28 Problems 49 and Two blocks are connected over a massless, frictionless pulley (igure 5-28). The mass of block 2 is 10.0 kg, and the reed_c05_ _st_hr2.indd 191 4/2/13 3:08 P

4 192 Chapter 5 orces and otion II: Applications coefficient of kinetic friction between block 2 and the incline is The angle u of the incline is If block 2 moves up the incline at constant speed, what is the mass of block 1? 51. An object with mass 1 of 2.85 kg is held in place on an inclined plane that makes an angle u of 40.0 with the horizontal (igure 5-29). The coefficient of static friction between the plane and the object is A second object that has a mass 2 of 4.75 kg is connected to the first object with a massless string over a massless, frictionless pulley. Calculate the initial acceleration of the system and the tension in the string once the objects are released. 2 1 Static friction u igure 5-29 Problem Draw free-body diagrams for the situation 1 shown in igure An 2 riction object of mass 2 rests on a frictionless table, and an object of mass 1 sits on it; there is friction between the objects. A horizontal force s is applied to the lower object as shown. igure 5-30 Problem 52 rictionless 53. A horizontal force of 10.0 N is applied to a stationary block with a mass of 2.00 kg as shown in igure The coefficient of static friction between the block and the floor is 0.750; the coefficient of kinetic friction is ind the acceleration of the box. SS riction igure 5-31 Problem An object moving through air or water experiences a drag force 54. Biology A single-celled animal called a paramecium propels itself quite rapidly through water by using its hairlike cilia. A certain paramecium experiences a drag force of magnitude drag = cv 2 in water, where the drag coefficient c is approximately What propulsion force does this paramecium generate when moving at a constant (terminal) speed v of * 10 3 m>s? 55. Biology The bacterium Escherichia coli propels itself with long, thin structures called flagella. When its flagella exert a force of 1.50 * N, the bacterium swims through water at a speed of 20.0 mm>s. ind the speed of the bacterium in water when the force exerted by its flagella is 3.00 * N. 56. We model the drag force of the atmosphere as proportional to the square of the speed of a falling object, drag = cv 2, where the value of c for a 70.0-kg person with a parachute is 18.0 kg>m. (a) What is the person s terminal velocity? (b) Without a parachute, the same person s terminal velocity would be about 50.0 m>s. What would be the value of the proportionality constant c in that case? 57. A girl rides her scooter on a hill that is inclined at 10 with the horizontal. The combined mass of the girl and scooter is 50.0 kg. On the way down, she coasts at a constant speed of 12.0 m>s, while experiencing a drag force that is proportional to the square of her velocity. What force, parallel to the surface of the hill, is required to increase her speed to 20.0 m>s? Neglect any other resistive forces. 5-6 In uniform circular motion, the net force points toward the center of the circle 58. A hockey puck that has a mass of 170 g is tied to a light string and spun in a circle of radius 1.25 m (on frictionless ice). If the string breaks under a tension that exceeds 5.00 N, what is the maximum speed of the puck without breaking the string? 59. A 1500-kg truck rounds an unbanked curve on the highway at a speed of 20.0 m>s. If the maximum frictional force between the surface of the road and all four of the tires is 8000 N, calculate the minimum radius of curvature for the curve to prevent the truck from skidding off the road. SS 60. A 25.0-g metal washer is tied to a 60.0-cm-long string and whirled around in a vertical circle at a constant speed of 6.00 m>s. Calculate the tension in the string (a) when the washer is at the bottom of the circular path and (b) when it is at the top of the path. 61. A centrifuge spins small tubes in a circle of radius 10.0 cm at a rate of 1200 rev>min. What is the centripetal force on a sample that has a mass of 1.00 g? SS 62. Astro What centripetal force is exerted on the oon as it orbits about Earth at a center-to-center distance of 3.84 * 10 8 m with a period of 27.4 days? What is the source of the force? The mass of the oon is equal to 7.35 * kg. 63. Biology Very high-speed ultracentrifuges are useful devices to sediment materials quickly or to separate materials. An ultracentrifuge spins a small tube in a circle of radius 10.0 cm at 60,000 rev>min. What is the centripetal force experienced by a sample that has a mass of kg? 64. At the ermi National Accelerator Laboratory (ermilab), a large particle accelerator, protons are made to travel in a circular orbit 6.3 km in circumference at a speed of nearly 3.0 * 10 8 m>s. What is the centripetal acceleration of one of the protons? 65. In the game of tetherball, a 1.25-m rope connects a kg ball to the top of a 1.25 m u vertical pole so that the ball can spin around the pole as 0.75 kg shown in igure What is the speed of the ball as it rotates around the pole when the angle u of the rope is 35.0 with the vertical? SS igure 5-32 Problem 65 reed_c05_ hr3.indd 192 9/17/12 4:06 P

### 66 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

### Assignment 4.2 Frictional Forces CONCEPTUAL QUESTIONS: 1. What is the SI unit of the coefficient of friction (μ s or μ k )?

CONCEPTUAL QUESTIONS: 1. What is the SI unit of the coefficient of friction (μ s or μ k )? 2. Tennis is played on clay, grass, and hard surfaces. Please explain why you think tennis players have or don

### Lecture PowerPoints. Chapter 5 Physics for Scientists & Engineers, with Modern Physics, 4 th edition. Giancoli

Lecture PowerPoints Chapter 5 Physics for Scientists & Engineers, with Modern Physics, 4 th edition 2009 Pearson Education, Inc. This work is protected by United States copyright laws and is provided solely

### MULTIPLE 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

### WS-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

### Review PHYS114 Chapters 4-7

Review PHYS114 Chapters 4-7 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 27 kg object is accelerated at a rate of 1.7 m/s 2. What force does

### Circular Velocity and Centripetal Acceleration

1. An object is spun around in circular motion such that it completes 100 cycles in 25 s. a. What is the period of its rotation? [0.25 s] b. If the radius is 0.3 m what is the velocity? [7.54 m/s] c. Draw

### MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Diagram 1 A) B - A. B) A - B. C) A + B. D) A B.

Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) In the diagram shown, the unknown vector is 1) Diagram 1 A) B - A. B) A - B. C) A + B.

### HATZIC SECONDARY SCHOOL

HATZIC SECONDARY SCHOOL PROVINCIAL EXAMINATION ASSIGNMENT CIRCULAR MOTION MULTIPLE CHOICE / 30 OPEN ENDED / 65 TOTAL / 95 NAME: 1. An object travels along a path at constant speed. There is a constant

### Reading Quiz. Chapter 5. Physics 111, Concordia College

Reading Quiz Chapter 5 1. The coefficient of static friction is A. smaller than the coefficient of kinetic friction. B. equal to the coefficient of kinetic friction. C. larger than the coefficient of kinetic

### End-of-Chapter Exercises

End-of-Chapter Exercises For all these exercises, assume that all strings are massless and all pulleys are both massless and frictionless. We will improve our model and learn how to account for the mass

### Study Questions/Problems Week 4

Study Questions/Problems Week 4 Chapter 6 treats many topics. I have selected on average less than three problems from each topic. I suggest you do them all. Likewise for the Conceptual Questions and exercises,

### 4) Vector = and vector = What is vector = +? A) B) C) D) E)

1) Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion? A) In equal times its speed changes by equal amounts. B) In

### AP Physics C: Mechanics Practice (Newton s Laws including friction, resistive forces, and centripetal force).

AP Physics C: Mechanics Practice (Newton s Laws including friction, resistive forces, and centripetal force). 1981M1. A block of mass m, acted on by a force of magnitude F directed horizontally to the

### C) D) 2. The diagram below shows a worker using a rope to pull a cart.

1. Which graph best represents the relationship between the acceleration of an object falling freely near the surface of Earth and the time that it falls? 2. The diagram below shows a worker using a rope

### MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Common Quiz Mistakes / Practice for Final Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A ball is thrown directly upward and experiences

### Name St. Mary's HS AP Physics Circular Motion HW

Name St. Mary's HS AP Physics Circular Motion HW Base your answers to questions 1 and 2 on the following situation. An object weighing 10 N swings at the end of a rope that is 0.72 m long as a simple pendulum.

### FRICTIONAL FORCES. Direction of frictional forces... (not always obvious)... CHAPTER 5 APPLICATIONS OF NEWTON S LAWS

RICTIONAL ORCES CHAPTER 5 APPLICATIONS O NEWTON S LAWS rictional forces Static friction Kinetic friction Centripetal force Centripetal acceleration Loop-the-loop Drag force Terminal velocity Direction

### Physics 12. Unit 5 Circular Motion and Gravitation Part 1

Physics 12 Unit 5 Circular Motion and Gravitation Part 1 1. Nonlinear motions According to the Newton s first law, an object remains its tendency of motion as long as there is no external force acting

### Circular Motion.

1 Circular Motion www.njctl.org 2 Topics of Uniform Circular Motion (UCM) Kinematics of UCM Click on the topic to go to that section Period, Frequency, and Rotational Velocity Dynamics of UCM Vertical

### Hint 1. The direction of acceleration can be determined from Newton's second law

Chapter 5 [ Edit ] Overview Summary View Diagnostics View Print View with Answers Chapter 5 Due: 11:59pm on Sunday, October 2, 2016 To understand how points are awarded, read the Grading Policy for this

### F 2 = 26 N.What third force will cause the object to be in equilibrium (acceleration equals zero)?

FLEX Physical Science AP Physics C Mechanics - Midterm 1) If you set the cruise control of your car to a certain speed and take a turn, the speed of the car will remain the same. Is the car accelerating?

### Newton s Laws.

Newton s Laws http://mathsforeurope.digibel.be/images Forces and Equilibrium If the net force on a body is zero, it is in equilibrium. dynamic equilibrium: moving relative to us static equilibrium: appears

### Kinematics. v (m/s) ii. Plot the velocity as a function of time on the following graph.

Kinematics 1993B1 (modified) A student stands in an elevator and records his acceleration as a function of time. The data are shown in the graph above. At time t = 0, the elevator is at displacement x

### B) v `2. C) `2v. D) 2v. E) 4v. A) 2p 25. B) p C) 2p. D) 4p. E) 4p 2 25

1. 3. A ball attached to a string is whirled around a horizontal circle of radius r with a tangential velocity v. If the radius is changed to 2r and the magnitude of the centripetal force is doubled the

### 2. Kinetic friction - The force that acts against an object s motion. - Occurs once static friction has been overcome and object is moving

Section 2.14: 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

### There 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

### Circular Motion. 2 types of Acceleration. Centripetal Force and Acceleration. In a circle. Constant Velocity vs. Constant Speed.

Circular Motion What does it mean to accelerate Centripetal Force and Acceleration Constant Velocity vs. Constant Speed. 2 types of Acceleration In a circle Direction of acceleration / velocity top view

### Announcements 24 Sep 2013

Announcements 24 Sep 2013 1. If you have questions on exam 1 2. Newton s 2 nd Law Problems: F m a. Inclined planes b. Pulleys c. Ropes d. Friction e. Etc Remember N2 is a blueprint for obtaining a useful

### Unit 5 Circular Motion and Gravitation

Unit 5 Circular Motion and Gravitation In the game of tetherball, the struck ball whirls around a pole. In what direction does the net force on the ball point? 1) Tetherball 1) toward the top of the pole

### 1. 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.

### Chapter 6. Force and Motion II

Chapter 6 Force and Motion II 6 Force and Motion II 2 Announcement: Sample Answer Key 3 4 6-2 Friction Force Question: If the friction were absent, what would happen? Answer: You could not stop without

### REVIEW SET 2 MIDTERM 2

Physics 2010 Fall 2012 Orest Symko REVIEW SET 2 MIDTERM 2 1. In a popular amusement park ride, a rotating cylinder of radius 15.0 m rotates with an angular speed of 8.0 rad/s. The floor of then drops away

### Cutnell/Johnson Physics

Cutnell/Johnson Physics Classroom Response System Questions Chapter 5 Dynamics of Uniform Circular Motion Interactive Lecture Questions 5.1.1. An airplane flying at 115 m/s due east makes a gradual turn

### Algebra Based Physics Uniform Circular Motion

1 Algebra Based Physics Uniform Circular Motion 2016 07 20 www.njctl.org 2 Uniform Circular Motion (UCM) Click on the topic to go to that section Period, Frequency and Rotational Velocity Kinematics of

### (1) +0.2 m/s (2) +0.4 m/s (3) +0.6 m/s (4) +1 m/s (5) +0.8 m/s

77777 77777 Instructor: Biswas/Ihas/Whiting PHYSICS DEPARTMENT PHY 2053 Exam 2, 120 minutes November 13, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized

### Exam. Name. 1) For general projectile motion with no air resistance, the horizontal component of a projectile's velocity A) B) C) D)

Exam Name 1) For general projectile motion with no air resistance, the horizontal component of a projectile's velocity 2) An athlete participates in an interplanetary discus throw competition during an

### Dynamics-Friction. 1. Which vector diagram best represents a cart slowing down as it travels to the right on a horizontal surface?

1. Which vector diagram best represents a cart slowing down as it travels to the right on a horizontal surface? Base your answers to questions 2 and 3 on the information A student and the waxed skis she

### a reference frame that accelerates in a straight line a reference frame that moves along a circular path Straight Line Accelerated Motion

1.12.1 Introduction Go back to lesson 9 and provide bullet #3 In today s lesson we will consider two examples of non-inertial reference frames: a reference frame that accelerates in a straight line a reference

### Friction is always opposite to the direction of motion.

6. Forces and Motion-II Friction: The resistance between two surfaces when attempting to slide one object across the other. Friction is due to interactions at molecular level where rough edges bond together:

### PRACTICE TEST for Midterm Exam

South Pasadena AP Physics PRACTICE TEST for Midterm Exam FORMULAS Name Period Date / / d = vt d = v o t + ½ at 2 d = v o + v 2 t v = v o + at v 2 = v 2 o + 2ad v = v x 2 + v y 2 = tan 1 v y v v x = v cos

### y(t) = y 0 t! 1 2 gt 2. With y(t final ) = 0, we can solve this for v 0 : v 0 A ĵ. With A! ĵ =!2 and A! = (2) 2 + (!

1. The angle between the vector! A = 3î! 2 ĵ! 5 ˆk and the positive y axis, in degrees, is closest to: A) 19 B) 71 C) 90 D) 109 E) 161 The dot product between the vector! A = 3î! 2 ĵ! 5 ˆk and the unit

### Dynamics Test K/U 28 T/I 16 C 26 A 30

Name: Dynamics Test K/U 28 T/I 16 C 26 A 30 A. True/False Indicate whether the sentence or statement is true or false. 1. The normal force that acts on an object is always equal in magnitude and opposite

### Name Period Date A) B) C) D)

Example Problems 9.2 E1. A car rounds a curve of constant radius at a constant speed. Which diagram best represents the directions of both the car s velocity and acceleration? Explain: A) B) C) D) E2.

### 1. In which situation is an object undergoing centripetal acceleration? (C) a car accelerating on a drag strip (D) a hockey puck gliding on ice

Physics 3204 Assignment 2.1 UCM DUE: Thursday Nov 24, 2017 Name: Part A. Multiple Choice: Select the best possible answer. Place the answer on the answer sheet. 1. In which situation is an object undergoing

### Q2. 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

### Chapter 6. Force and Motion-II (Friction, Drag, Circular Motion)

Chapter 6 Force and Motion-II (Friction, Drag, Circular Motion) 6.2 Frictional Force: Motion of a crate with applied forces There is no attempt at sliding. Thus, no friction and no motion. NO FRICTION

### ΣF=ma SECOND LAW. Make a freebody diagram for EVERY problem!

PHYSICS HOMEWORK #31 SECOND LAW ΣF=ma NEWTON S LAWS Newton s Second Law of Motion The acceleration of an object is directly proportional to the force applied, inversely proportional to the mass of the

### HSC 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

### Name: Date: Period: AP Physics C Work HO11

Name: Date: Period: AP Physics C Work HO11 1.) Rat pushes a 25.0 kg crate a distance of 6.0 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction

### The diagram below shows a block on a horizontal frictionless surface. A 100.-newton force acts on the block at an angle of 30. above the horizontal.

Name: 1) 2) 3) Two students are pushing a car. What should be the angle of each student's arms with respect to the flat ground to maximize the horizontal component of the force? A) 90 B) 0 C) 30 D) 45

### 3 Using Newton s Laws

3 Using Newton s Laws What You ll Learn how Newton's first law explains what happens in a car crash how Newton's second law explains the effects of air resistance 4(A), 4(C), 4(D), 4(E) Before You Read

### CHAPTER 4 TEST REVIEW -- Answer Key

AP PHYSICS Name: Period: Date: DEVIL PHYSICS BADDEST CLASS ON CAMPUS 50 Multiple Choice 45 Single Response 5 Multi-Response Free Response 3 Short Free Response 2 Long Free Response AP EXAM CHAPTER TEST

### Show all workings for questions that involve multiple choice.

Assignment 2 Unit 2 Newton s Laws (Outcomes 325-5, 325-8) Name: Multiple Choice: Show all workings for questions that involve multiple choice. 1 Which choice represents a NON-INERTIAL frame of reference?

### Page 1. Name: Section This assignment is due at the first class in 2019 Part I Show all work!

Name: Section This assignment is due at the first class in 2019 Part I Show all work! 7164-1 - Page 1 1) A car travels at constant speed around a section of horizontal, circular track. On the diagram provided

### FORCE AND MOTION. Conceptual Questions F G as seen in the figure. n, and a kinetic frictional force due to the rough table surface f k

FORCE AND MOTION 5 Conceptual Questions 5.1. Two forces are present, tension T in the cable and gravitational force 5.. F G as seen in the figure. Four forces act on the block: the push of the spring F

### REVIEW SET 2 MIDTERM 2

Physics 2010 Fall 2009 Sid Rudolph REVIEW SET 2 MIDTERM 2 1. In a popular amusement park ride, a rotating cylinder of radius 15.0 m rotates with an angular speed of 8.0 rad/s. The floor of then drops away

### Circular motion minutes. 62 marks. theonlinephysicstutor.com. facebook.com/theonlinephysicstutor Page 1 of 22. Name: Class: Date: Time: Marks:

Circular motion 2 Name: Class: Date: Time: 67 minutes Marks: 62 marks Comments: Page 1 of 22 1 A lead ball of mass 0.25 kg is swung round on the end of a string so that the ball moves in a horizontal circle

### Review 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

### Practice 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

### Quest Chapter 09. Eliminate the obviously wrong answers. Consider what is changing: speed, velocity, some part of velocity? Choose carefully.

1 A dragster maintains a speedometer reading of 100 km/h and passes through a curve with a constant radius. Which statement is true? 1. The dragster rounded the curve at a changing speed of 100 km/h. 2.

### Circular Motion. - The velocity is tangent to the path and perpendicular to the radius of the circle

Circular Motion Level : Physics Teacher : Kim 1. Uniform Circular Motion - According to Newton s 1 st law, an object in motion will move in a straight line at a constant speed unless an unbalance force

### Forces and Newton s Laws

chapter 3 Forces and Newton s Laws section 3 Using Newton s Laws Before You Read Imagine riding on a sled, or in a wagon, or perhaps a school bus that stops quickly or suddenly. What happens to your body

### 2) A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s 2. How far does it travel while accelerating? A) 207 m B) 117 m C) 41 m D) 69 m

Name VECTORS 1) An airplane undergoes the following displacements: First, it flies 59 km in a direction 30 east of north. Next, it flies 58 km due south. Finally, it flies 100 km 30 north of west. Using

### Chapters 5-6. Dynamics: Forces and Newton s Laws of Motion. Applications

Chapters 5-6 Dynamics: orces and Newton s Laws of Motion. Applications That is, describing why objects move orces Newton s 1 st Law Newton s 2 nd Law Newton s 3 rd Law Examples of orces: Weight, Normal,

### AP C - Webreview ch 7 (part I) Rotation and circular motion

Name: Class: _ Date: _ AP C - Webreview ch 7 (part I) Rotation and circular motion Multiple Choice Identify the choice that best completes the statement or answers the question. 1. 2 600 rev/min is equivalent

### University 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

### Circular Motion PreTest

Circular Motion PreTest Date: 06/03/2008 Version #: 0 Name: 1. In a series of test runs, a car travels around the same circular track at different velocities. Which graph best shows the relationship between

### PYP 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

### Twentieth 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,

### CIRCULAR MOTION AND GRAVITATION

CIRCULAR MOTION AND GRAVITATION An object moves in a straight line if the net force on it acts in the direction of motion, or is zero. If the net force acts at an angle to the direction of motion at any

### UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics

UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics 111.6 MIDTERM TEST #2 November 16, 2000 Time: 90 minutes NAME: STUDENT NO.: (Last) Please Print (Given) LECTURE SECTION

### A) 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)

### 1. Which one of the following situations is an example of an object with a non-zero kinetic energy?

Name: Date: 1. Which one of the following situations is an example of an object with a non-zero kinetic energy? A) a drum of diesel fuel on a parked truck B) a stationary pendulum C) a satellite in geosynchronous

### Online homework #6 due on Tue March 24

Online homework #6 due on Tue March 24 Problem 5.22 Part A: give your answer with only 2 significant digits (i.e. round answer and drop less significant digits) 51 Equilibrium Question 52 1 Using Newton

### Practice Test for Midterm Exam

A.P. Physics Practice Test for Midterm Exam Kinematics 1. Which of the following statements are about uniformly accelerated motion? Select two answers. a) If an object s acceleration is constant then it

### Chapter 4. Dynamics: Newton s Laws of Motion. That is, describing why objects move

Chapter 4 Dynamics: Newton s Laws of Motion That is, describing why objects move orces Newton s 1 st Law Newton s 2 nd Law Newton s 3 rd Law Examples of orces: Weight, Normal orce, Tension, riction ree-body

### Page 2. Q1.A satellite X is in a circular orbit of radius r about the centre of a spherical planet of mass

Q1. satellite X is in a circular orbit of radius r about the centre of a spherical planet of mass M. Which line, to, in the table gives correct expressions for the centripetal acceleration a and the speed

### PHYS 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

### The net force on a moving object is suddenly reduced to zero. As a consequence, the object

The net force on a moving object is suddenly reduced to zero. As a consequence, the object (A) stops abruptly (B) stops during a short time interval (C) changes direction (D) continues at a constant velocity

### LAHS Physics Semester 1 Final Practice Multiple Choice

LAHS Physics Semester 1 Final Practice Multiple Choice The following Multiple Choice problems are practice MC for the final. Some or none of these problems may appear on the real exam. Answers are provided

### Show all workings for questions that involve calculations. No marks will be given for correct answers that are not supported by calculations.

Assignment 8 Unit 2 Newton s Laws (Outcomes 325-5, 325-8) Name: Multiple Choice: Show all workings for questions that involve calculations. No marks will be given for correct answers that are not supported

Name: ID #: Section #: PART I: MULTIPLE CHOICE QUESTIONS Choose the best answer for Questions 1-15 below. Mark your answer on your scantron form using a #2 pencil. 1. A 55.0-kg box rests on a horizontal

### Name Period Date. Record all givens, draw a picture, arrow all vectors, write the formula, substitute and solve. units

Example Problems 5.2 Friction E1. A monkey is dragging a box full of books from his office to his car. The combined weight of the box and books is 134 N. If the coefficient of static friction between the

### Phys 1401: General Physics I

1. (0 Points) What course is this? a. PHYS 1401 b. PHYS 1402 c. PHYS 2425 d. PHYS 2426 2. (0 Points) Which exam is this? a. Exam 1 b. Exam 2 c. Final Exam 3. (0 Points) What version of the exam is this?

### Preparing for Six Flags Physics Concepts

Preparing for Six Flags Physics Concepts uniform means constant, unchanging At a uniform speed, the distance traveled is given by Distance = speed x time At uniform velocity, the displacement is given

### Proficient. a. The gravitational field caused by a. The student is able to approximate a numerical value of the

Unit 6. Circular Motion and Gravitation Name: I have not failed. I've just found 10,000 ways that won't work.-- Thomas Edison Big Idea 1: Objects and systems have properties such as mass and charge. Systems

### Lecture Presentation. Chapter 4 Forces and Newton s Laws of Motion. Chapter 4 Forces and Newton s Laws of Motion. Reading Question 4.

Chapter 4 Forces and Newton s Laws of Motion Lecture Presentation Chapter 4 Forces and Newton s Laws of Motion Chapter Goal: To establish a connection between force and motion. Slide 4-2 Chapter 4 Preview

### SPH4U Sample Test Dynamics

1of14 True/False Indicate whether the sentence or statement is true or false. 1. The normal force that acts on an object is always equal in magnitude and opposite in direction to the gravitational force

### Phys , Fall04,Term 1 Exercise Problems

Page 1 1. The number of significant figures in the number 0.00593 is a. 5 b. 2 c. 3 d.6 2. The product of 10-4 and 105 is a. 1 b. 10 c. 0.1 d.100 3. The length of a car is given as 4.57 m. The percent

### 1. A baseball player throws a ball horizontally. Which statement best describes the ball's motion after it is thrown? [Neglect the effect of

1. A baseball player throws a ball horizontally. Which statement best describes the ball's motion after it is thrown? [Neglect the effect of friction.] A) Its vertical speed remains the same, and its horizontal

### PHYS 124 Section A1 Mid-Term Examination Spring 2006 SOLUTIONS

PHYS 14 Section A1 Mid-Term Examination Spring 006 SOLUTIONS Name Student ID Number Instructor Marc de Montigny Date Monday, May 15, 006 Duration 60 minutes Instructions Items allowed: pen or pencil, calculator

### Name Date Period PROBLEM SET: ROTATIONAL DYNAMICS

Accelerated Physics Rotational Dynamics Problem Set Page 1 of 5 Name Date Period PROBLEM SET: ROTATIONAL DYNAMICS Directions: Show all work on a separate piece of paper. Box your final answer. Don t forget

### 1. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? a. 35 m/s 2 c. 5.0 m/s 2 b. 7.0 m/s 2 d. 0.

Newton's Laws 1. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? a. 35 m/s 2 c. 5.0 m/s 2 b. 7.0 m/s 2 d. 0.71 m/s 2 2. An astronaut applies a force of 500 N to an

### Angular Speed and Angular Acceleration Relations between Angular and Linear Quantities

Angular Speed and Angular Acceleration Relations between Angular and Linear Quantities 1. The tires on a new compact car have a diameter of 2.0 ft and are warranted for 60 000 miles. (a) Determine the

### Chapter 6 Study Questions Name: Class:

Chapter 6 Study Questions Name: Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. A feather and a rock dropped at the same time from

### AP Physics 1 Lesson 9 Homework Outcomes. Name

AP Physics 1 Lesson 9 Homework Outcomes Name Date 1. Define uniform circular motion. 2. Determine the tangential velocity of an object moving with uniform circular motion. 3. Determine the centripetal

### AP Physics 1 Work Energy and Power Practice Test Name

AP Physics 1 Work Energy and Power Practice Test Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two objects, one of mass m and the other