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14 In calculating, you will find the total distance traveled. Displacement problems will find the distance from the starting point to the ending point.
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18 *Calculate the total amount traveled
19 What formula for triangles?
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25 *Here we have to consider the direction
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41 Bellringer-9/4/14 1. What is the difference between distance and displacement? 2. Solve for distance and displacement: A 7 B 8 C
42 Motion & Forces Describing Motion Motion Speed & Velocity Acceleration
43 Newton s First Law Newton s First Law of Motion An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.
44 A. Motion Problem: Is your desk moving? We need a reference point... nonmoving point from which motion is measured
45 A. Motion Motion Change in position in relation to a reference point. Reference point Motion
46 A. Motion Problem: You are a passenger in a car stopped at a stop sign. Out of the corner of your eye, you notice a tree on the side of the road begin to move forward. You have mistakenly set yourself as the reference point.
47 B. Speed & Velocity Speed rate of motion Speed is the distance traveled per unit time If you know the distance an object traveled in a set time, you can calculate speed speed distance time v d t
48 B. Speed & Velocity Instantaneous Speed speed at a given instant Average Speed avg. speed total distance total time
49 B. Speed & Velocity Problem: A storm is 10 km away and is moving at a speed of 60 km/h. Should you be worried? It depends on the storm s direction!
50 B. Speed & Velocity Velocity speed in a given direction (it is a vector!) can change even when the speed is constant! (storms!)
51 Speed v. Velocity 1. How are speed and velocity similar? They both measure how fast something is moving 2. How are speed and velocity different? Velocity includes the direction of motion and speed does not (the car is moving 5mph East) 3. Is velocity more like distance or displacement? Why? Displacement, because both are vectors which include an amount and a direction.
52 C. Acceleration Acceleration a v f - v i t rate at which velocity changes change in speed or direction a v f t v i a: acceleration v f : final velocity v i : initial velocity t: time
53 C. Acceleration Positive acceleration speeding up Negative acceleration slowing down
54 GIVEN: D. Calculations Your neighbor skates at a speed of 4 m/s. You can skate 100 m in 20 s. Who skates faster? WORK: d = 100 m v = d t t = 20 s v =? d v = (100 m) (20 s) v = 5 m/s v t You skate faster!
55 GIVEN: D. Calculations A roller coaster starts down a hill at 10 m/s. Three seconds later, its speed is 32 m/s. What is the roller coaster s acceleration? WORK: v i = 10 m/s t = 3 s v f = 32 m/s a =? a v f - v i t a = (v f - v i ) t a = (32m/s - 10m/s) (3s) a = 22 m/s 3 s a = 7.3 m/s 2
56 GIVEN: D. Calculations Sound travels 330 m/s. If a lightning bolt strikes the ground 1 km away from you, how long will it take for you to hear it? WORK: v = 330 m/s d = 1km = 1000m t =? d t = d v t = (1000 m) (330 m/s) t = 3.03 s v t
57 GIVEN: D. Calculations How long will it take a car traveling 30 m/s to come to a stop if its acceleration is -3 m/s 2? WORK: t =? v i = 30 m/s v f = 0 m/s a = -3 m/s 2 v f - v i t t = (v f - v i ) a t = (0m/s-30m/s) (-3m/s 2 ) t = -30 m/s -3m/s 2 a t = 10 s
58 E. Graphing Motion Distance-Time Graph A B slope = speed steeper slope = faster speed straight line = constant speed flat line = no motion
59 E. Graphing Motion Distance-Time Graph A B Who started out faster? A (steeper slope) Who had a constant speed? A Describe B from min. B stopped moving Find their average speeds. A = (2400m) (30min) A = 80 m/min B = (1200m) (30min) B = 40 m/min
60 Distance (m) E. Graphing Motion Distance-Time Graph Acceleration is indicated by a curve on a Distance-Time graph Time (s) Changing slope = changing velocity
61 Speed (m/s) E. Graphing Motion Speed-Time Graph 3 2 slope = acceleration +ve = speeds up -ve = slows down Time (s) straight line = constant accel. flat line = no accel. (constant velocity)
62 Speed (m/s) E. Graphing Motion 3 2 Speed-Time Graph Specify the time period when the object was... slowing down 5 to 10 seconds speeding up 0 to 3 seconds Time (s) moving at a constant speed 3 to 5 seconds not moving 0 & 10 seconds
63 Newton s Second Law Gravity Air Resistance Calculations
64 Newton s Second Law of Motion The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F = ma
65 a F m m F a F = ma F: force (N) m: mass (kg) a: accel (m/s 2 ) 1 N = 1 kg m/s 2
66 Gravity force of attraction between any two objects in the universe increases as... mass increases distance decreases
67 Who experiences more gravity - the astronaut or the politician? Which exerts more gravity - the Earth or the moon? less distance more mass
68 Weight the force of gravity on an object W = mg W: weight (N) m: mass (kg) g: acceleration due to gravity (m/s 2 ) MASS always the same (kg) VS WEIGHT depends on gravity (N)
69 Would you weigh more on Earth or Jupiter? Jupiter because... greater mass greater gravity greater weight
70 Accel. due to gravity (g) In the absence of air resistance, all falling objects have the same acceleration! On Earth: g = 9.8 m/s 2 W F g m a m elephant feather Animation from Multimedia Physics Studios.
71 Air Resistance a.k.a. fluid friction or drag force that air exerts on a moving object to oppose its motion depends on: speed surface area shape density of fluid
72 Terminal Velocity maximum velocity reached by a falling object reached when F grav = F air F air no net force no acceleration constant velocity F grav
73 Terminal Velocity increasing speed increasing air resistance until F air = F grav Animation from Multimedia Physics Studios.
74 Falling with air resistance heavier objects fall faster because they accelerate to higher speeds before reaching terminal velocity F grav = F air larger F grav need larger F air need higher speed Animation from Multimedia Physics Studios.
75 What force would be required to accelerate a 40 kg mass by 4 m/s 2? GIVEN: F =? m = 40 kg a = 4 m/s 2 F WORK: F = ma F = (40 kg)(4 m/s 2 ) F = 160 N m a
76 A 4.0 kg shotput is thrown with 30 N of force. What is its acceleration? GIVEN: m = 4.0 kg F = 30 N a =? F WORK: a = F m a = (30 N) (4.0 kg) a = 7.5 m/s 2 m a
77 Ms. F. weighs 557 N. What is her mass? GIVEN: F(W) = 557 N m =? a(g) = 9.8 m/s 2 F m a WORK: m = F a m = (557 N) (9.8 m/s 2 ) m = 56.8 kg
78 Is the following statement true or false? An astronaut has less mass on the moon since the moon exerts a weaker gravitational force. False! Mass does not depend on gravity, weight does. The astronaut has less weight on the moon.
79 Do Now How would you describe how fast an object is moving?
80 Speed, Velocity, and Acceleration
81 Goals: To investigate what is needed to describe motion completely. To compare and contrast speed and velocity. To learn about acceleration.
82 To describe motion accurately and completely, a frame of reference is needed.
83 An object is in motion if it changes position relative to a reference point. Objects that we call stationary such as a tree, a sign, or a building make good reference points. The passenger can use a tree as a reference point to decide if the train is moving. A tree makes a good reference point because it is stationary from the passenger s point of view.
84 Whether or not an object is in motion depends on the reference point you choose. Describing Motion
85 Distance When an object moves, it goes from point A to point B that is the DISTANCE it traveled. (SI unit is the meter) B A
86 Displacement Knowing how far something moves is not sufficient. You must also know in what direction the object moved. A quantity that has magnitude and direction is called a V E C T O R
87 Speed Calculating Speed: If you know the distance an object travels in a certain amount of time, you can calculate the speed of the object. What is instantaneous speed? Speed = Distance/time Average speed = Total distance/total time
88 Velocity Velocity is a description of an object s speed and direction. It is a vector. As the sailboat s direction changes, its velocity also changes, even if its speed stays the same. If the sailboat slows down at the same time that it changes direction, how will its velocity be changed?
89 Speed v. Velocity 1. How are speed and velocity similar? They both measure how fast something is moving 2. How are speed and velocity different? Velocity includes the direction of motion and speed does not (the car is moving 5mph East) 3. Is velocity more like distance or displacement? Why? Displacement, because both are vectors which include an amount and a direction.
90 Graphing Speed D I S T A N C E Speed increasing Object is stopped Object begins moving at a different speed T I M E
91 The steepness of a line on a graph is called slope. The steeper the slope is, the greater the speed. A constant slope represents motion at constant speed. Using the points shown, the rise is 400 meters and the run is 2 minutes. To find the slope, you divide 400 meters by 2 minutes. The slope is 200 meters per minute.
92 Do Now: Set up formula triangles to find speed and velocity
93 Acceleration Acceleration is the rate at which velocity changes. Acceleration can result from a change in speed (increase or decrease), a change in direction (back, forth, up, down left, right), or changes in both. Like velocity, acceleration is a vector.
94 The pitcher throws. The ball speeds toward the batter. Off the bat it goes. It s going, going, gone! A home run! Before landing, the ball went through several changes in motion. It sped up in the pitcher s hand, and lost speed as it traveled toward the batter. The ball stopped when it hit the bat, changed direction, sped up again, and eventually slowed down. Most examples of motion involve similar changes. In fact, rarely does any object s motion stay the same for very long.
95 Understanding Acceleration 1. As the ball falls from the girl s hand, how does its speed change? 2. What happens to the speed of the ball as it rises from the ground back to her hand? 3. At what point does the ball have zero velocity? 4. How does the velocity of the ball change when it bounces on the floor?
96 You can feel acceleration! If you re moving at 500mph east without turbulence, there is no acceleration. But if the plane hits an air pocket and drops 500 feet in 2 seconds, there is a large change in acceleration and you will feel that! It does not matter whether you speed up or slow down; it is still considered a change in acceleration.
97 In science, acceleration refers to increasing speed, decreasing speed, or changing direction. A car that begins to move from a stopped position or speeds up to pass another car is accelerating. A car decelerates when it stops at a red light. A water skier decelerates when the boat stops pulling. A softball accelerates when it changes direction as it is hit.
98 Calculating Acceleration Acceleration = Change in velocity Total time Change in velocity = final velocity-initial velocity OR.. = final speed-initial speed So Acceleration = (Final speed Initial speed) Time
99 Calculating Acceleration As a roller-coaster car starts down a slope, its speed is 4 m/s. But 3 seconds later, at the bottom, its speed is 22 m/s. What is its average acceleration? What information have you been given? Initial speed = 4 m/s Final Speed = 22 m/s Time = 3 s
100 Calculating Acceleration What quantity are you trying to calculate? The average acceleration of the roller-coaster car. What formula contains the given quantities and the unknown quantity? Acceleration = (Final speed Initial speed)/time Perform the calculation. Acceleration = (22 m/s 4 m/s)/3 s = 18 m/s/3 s Acceleration = 6 m/s2 The roller-coaster car s average acceleration is 6 m/s2.
101 Graphing acceleration S P E E D Object accelerates Object moves at constant speed Object decelerates T i m e
102 The slanted, straight line on this speed-versus-time graph tells you that the cyclist is accelerating at a constant rate. The slope of a speedversus-time graph tells you the object s acceleration. Predicting How would the slope of the graph change if the cyclist were accelerating at a greater rate? At a lesser rate?
103 Since the slope is increasing, you can conclude that the speed is also increasing. You are accelerating. Distance-Versus- Time Graph The curved line on this distance-versus-time graph tells you that the cyclist is accelerating.
104 Projectile Motion Circular Motion Free-fall
105 Projectile any object thrown in the air acted upon only by gravity follows a parabolic path called a trajectory has horizontal and vertical velocities PROJECTILE MINI-LAB
106 Projectile Velocities Horizontal and vertical velocities are independent of each other!
107 Horizontal Velocity depends on inertia remains constant Vertical Velocity depends on gravity accelerates downward at 9.8 m/s 2
108 A moving truck launches a ball vertically (relative to the truck). If the truck maintains a constant horizontal velocity after the launch, where will the ball land (ignore air resistance)? A) In front of the truck B) Behind the truck C) In the truck C) In the truck. The horizontal velocity of the ball remains constant and is unaffected by its vertical motion. Animation from Multimedia Physics Studios.
109 Centripetal Acceleration acceleration toward the center of a circular path caused by centripetal force B-BALL DEMO PLATE DEMO
110 On the ground... friction provides centripetal force (Centripetal force is a force that makes a body follow a curved path)
111 In orbit... gravity provides centripetal force ROUND LAB
112 In orbit... Which satellites travel faster? Near-Earth Satellites Geostationary Satellites
113 Free-Fall when an object is influenced only by the force of gravity Has a constant acceleration Weightlessness sensation produced when an object and its surroundings are in free-fall (no force of support on your body) object is not weightless! CUP DEMO
114 Weightlessness surroundings are falling at the same rate so they don t exert a force on the object
115 Go to NASA. Go to CNN.com. Go to Space Settlement Video Library. Space Shuttle Missions
116 TRUE or FALSE: An astronaut on the Space Shuttle feels weightless because there is no gravity in space. FALSE! There is gravity which is causing the Shuttle to free-fall towards the Earth. She feels weightless because she s free-falling at the same rate.
117 Describe the path of a marble as it leaves the spiral tube shown below. It will travel in a straight line since the tube is no longer exerting a net force on it.
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119 Solve: 1. If Ms. Farris walks 3 blocks east, 5 blocks south, and 3 blocks west, what distance has she traveled? 2. If Ms. Farris walks 3 blocks east, 5 blocks south, and 3 blocks west, what is her displacement? 3. What is the momentum of a 3 kg toy truck that moves at 30 m/s? (2 points)
120 How do we cite articles in APA format? e-giant-black-hole-discovered-dwarf-galaxyn htm 0/01/ 1 paragraph should be a summary of your article; second paragraph should be your reaction (5-7 sentences)
121 An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force.
122 The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F=MA What do those variables stand for?
123 When one object exerts force on a second object, the second one exerts a force on the first that is equal in strength and opposite in direction
124 Define the following on a sheet of paper in your own words Inertia Force Velocity Speed Terminal Velocity Mass Weight
125 Force-The push or pull exerted on an object Inertia-tendency of an object to resist motion Speed-Rate of motion; Rate of change in an objects position Velocity-Speed of object + it s direction Terminal Velocity-Largest velocity reached by falling object; point where gravity equals force Mass-amount of matter in an object; does not change Weight-changes based on gravity
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