What is momentum? Inertia in Motion.
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1 What is momentum? Inertia in Motion. p = mv
2 From Newton s 2 nd Law: F = ma = dv d( mv) m = dt dt F = dp dt The time rate of change of the linear momentum of a particle is equal to the net force acting on the particle.
3 What is Impulse? Impulse changes momentum. F = ma = dv m dt Fdt = mdv = I = p Fdt
4 Collisions A collision is a shortduration interaction between two objects. The collision between a tennis ball and a racket is quick, but it is not instantaneous. Notice that the right side of the ball is flattened. It takes time to compress the ball, and more time for the ball to re-expand as it leaves the racket. Slide 9-24
5 = = I p Fdt Impulse During a Collision A large force exerted for a small interval of time is called an impulsive force. The figure shows a particle with initial velocity. The particle experiences an impulsive force of short duration t. The particle leaves with final velocity. Slide 9-26
6 Impulse-Momentum Theorem The impulse of the force F acting on a particle equals the change in momentum of the particle. = = I p Fdt For a time-averaged force: I = p = F t
7 Same Impulse, different Force and Time. I = p = F t
8 Same Impulse, different Force and Time. I = p = F t
9 A 2000-kg truck traveling at a speed of 6.0 m/s makes a 90 turn in a time of 4.0 s and emerges from this turn with a speed of 4.0 m/s. What is the magnitude of the average resultant force on the truck during this turn? a. 4.0 kn b. 5.0 kn c. 3.6 kn d. 6.4 kn e kn p = F t
10 Baseball Bat Wack! What is the impulse and average force exerted on a kg baseball by a bat given that the ball s initial speed is 45.0m/s and its final speed, after 1.3ms impact, is 65.0m/s in the opposite direction? I= p= p p = mv ( v) f 0 f 0 = 0.14 kg(65 m/ s ( 45 m/ s)) = 15.4 kgm/ s F p = = t (15.4 kg m / s) 3 1.3x10 s 4 = 1.18x10 N + NOTE: Direction Matters! Vectors!!
11 Example 9.1 Hitting a Baseball Slide 9-44
12 Example 9.1 Hitting a Baseball Slide 9-45
13 QuickCheck The cart s change of momentum p x is A. 20 kg m/s. B. 10 kg m/s. C. 0 kg m/s. D. 10 kg m/s. E. 30 kg m/s. Slide 9-22
14 QuickCheck 9.1 The cart s change of momentum p x is A. 20 kg m/s. B. 10 kg m/s. C. 0 kg m/s. D. 10 kg m/s. E. 30 kg m/s. p x = 10 kg m/s ( 20 kg m/s) = 30 kg m/s Negative initial momentum because motion is to the left and v x < 0. Slide 9-23
15 QuickCheck 9.2 A 2.0 kg object moving to the right with speed 0.50 m/s experiences the force shown. What are the object s speed and direction after the force ends? A m/s left. B. At rest. C m/s right. D. 1.0 m/s right. E. 2.0 m/s right. Slide 9-31
16 QuickCheck 9.2 A 2.0 kg object moving to the right with speed 0.50 m/s experiences the force shown. What are the object s speed and direction after the force ends? A m/s left. B. At rest. C m/s right. D. 1.0 m/s right. E. 2.0 m/s right. p x = J x or p fx = p ix + J x Slide 9-32
17 QuickCheck 9.7 You awake in the night to find that your living room is on fire. Your one chance to save yourself is to throw something that will hit the back of your bedroom door and close it, giving you a few seconds to escape out the window. You happen to have both a sticky ball of clay and a super-bouncy Superball next to your bed, both the same size and same mass. You ve only time to throw one. Which will it be? Your life depends on making the right choice! A. Throw the Superball. B. Throw the ball of clay. C. It doesn t matter. Throw either. Slide 9-51
18 QuickCheck 9.7 You awake in the night to find that your living room is on fire. Your one chance to save yourself is to throw something that will hit the back of your bedroom door and close it, giving you a few seconds to escape out the window. You happen to have both a sticky ball of clay and a super-bouncy Superball next to your bed, both the same size and same mass. You ve only time to throw one. Which will it be? Your life depends on making the right choice! A. Throw the Superball. Larger p more impulse to door B. Throw the ball of clay. C. It doesn t matter. Throw either. Slide 9-52
19 Bounce/ No Bounce No Bounce: p = 0 mv = mv 0 0 Bounce: p= p p = mv ( ( v)) f 0 f 0 = m( v + v ) = 2mv Bounce gives you twice as much WACK! Bounce has to stop the object AND give it p in the opposite direction!
20 The Impulse-Momentum Theorem A rubber ball bounces off a wall. The ball is initially traveling toward the right, so v ix and p ix are positive. After the bounce, v fx and p fx are negative. The force on the ball is toward the left, so F x is negative. In this example, the impulse, or area under the force curve, has a negative value. Slide 9-30
21 Bounce: Momentum is a Vector!! A ball with mass.0047 kg. hits the ground as shown. What is the the impulse applied to the ball by the floor? I = p= p p f = ( piˆ+ p ˆj) ( piˆ+ p ˆj) 0 x y f x y i = ( p p ) ˆj y f y0 = mv ( cos θ ( vcos θ)) ˆj = 2mv cosθ ˆj = 2(.0047 kg)(45 m / s)(cos30) ˆj I = (0.366 kg m / s) ˆj +
22 Newton s Third Law F action = F reaction p t ball = p cannon t p ball = p cannon dp total dt = 0 ( mv mv ) = ( mv mv ) b bf b b0 c cf c c0 mv + mv = mv + mv b bf c cf b b0 c c0 p = p Conservation of total, before total, after Momentum!
23 Conservation of Momentum If there are no external forces acting on a system of objects then the total momentum before an event is equal to the total momentum after an event. p before = p after System: You define the system so that momentum is conserved. No external forces acting on the system Internal forces cancel out and don t change momentum Include all the objects that collide or go bump Always apply conservation laws to a system When you have defined the system so that the net external forces acting is zero, THEN & ONLY THEN can you invoke Conservation of momentum!
24 ONLY AFTER you have defined the system so that the net external forces acting on it is zero, THEN & ONLY THEN can you invoke Conservation of Momentum and apply: p before = p after
25 Conservation of Momentum Momentum is conserved for which system? (a) (b) (c) INCLUDE EVERYTHING THAT GOES BUMP! NOTICE HOW THE INTERNAL FORCES CANCEL!
26 Conservation of Momentum If there are no external forces acting on a system of objects then the total momentum before an event is equal to the total momentum after an event. The system 100kg 100kg p = mv + 0 = mv before THE EVENT v pafter = 2m = mv 2
27 Conservation Depends on The System 100kg 100kg pbefore = mv THE EVENT External Force! p after = m v 2 Momentum is NOT conserved for this system!
28 MOMENTUM IS CONSERVED! NOT VELOCITY! p before = p after v before = v after This is true ONLY for The CM!
29 Perfectly Inelastic Collisions: Stick Velocity Kinetic Energy is NOT Conserved!
30 Elastic Collisions: Bounce Momentum is transferred! Kinetic Energy is Conserved!
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33 Collision Decision Both trucks have the same speed and mass. In our simple physics world, what is NOT allowed: a) Bounce off each other Elastic b) Stick and move to the left Impossible c) Stick and move to the right Impossible d) Stick and stop dead in the center Inelastic e) Vaporize Matter-Antimatter trucks!
34 Granny: m=50kg, v 0 =3m/s Andy: m=25kg, v 0 =0 p initial = p final 1 mv = ( m + m ) v 1 1i 1 2 v f = mv 1 1i ( m + m ) kg 3 m / s = (50kg + 25 kg) f 2 = 2 m/ s Before After
35
36 Perfectly Inelastic Collision What s the Final velocity?
37 2-D Collisions
38 Collision Intuition A B C D E Equal Masses Equal Speeds
39 Collision Intuition A B C D E Equal Masses Equal Speeds
40 Collision Intuition A B C D E Unequal Masses Equal Speeds
41 Collision Intuition A B C D E Unequal Masses Equal Speeds
42 Collision Intuition A B C D E Equal Masses Unequal Speeds
43 Collision Intuition A B C D E Equal Masses Unequal Speeds
44 Collision Intuition A B C? D E Unequal Masses Unequal Speeds
45 A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35 with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision? a. 2.2 m/s b. 2.9 m/s c. 4.2 m/s d. 3.5 m/s e. 4.7 m/s
46 Exploding Systems p before = p after
47 Charlie and his gun, m = 80kg, shoots off a bullet, m =.01kg, straight ahead at 300 m/s. What is Charlie s (+gun) recoil velocity? 1. Define the System so net external forces is zero. 2. THEN momentum is conserved p initial = p final p + p = p + p charlie, i bullet, i charlie, f bullet, f p 0 = pcharlie, f + pgun, f = p charlie, f bullet, f mv = mv c cf b bf v cf m = m b c v bf.01kg = 300 m/ s 80kg =.04 m/ s Frictionless surface
48 Conservation of Momentum +x The toy rocket in deep space breaks into equal masses. Find the final velocities of the masses and show that the velocity of the CM is equal to the initial velocity. Ignore gravity and air resistance. p i = p p = p p = xi 2 cos 30 cos 60 xf f yi mv = mv1 + mv2 = 1 2 Substitute: p yf 0 mv sin 30 mv sin 60 v1 = v2 sin 60 sin 30 sin 60 2 mv = m( v2 )cos30 + mv2cos 60 sin 30 2v 2(50 m/ s) v2 = = = 50 m/ s (sin 60 / tan 30 + cos 60) (sin 60 / tan 30 + cos 60) v = v 1 2 sin 60 sin 30 sin 60 = (50 m/ s) = 86.6 m/ s sin 30 You can also use vector addition!!!
49 A 4.0-kg mass has a velocity of 4.0 m/s, east when it explodes into two 2.0-kg masses. After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60 north of east. What is the magnitude of the velocity of the other mass after the explosion? a. 7.9 m/s b. 8.9 m/s c. 7.0 m/s d. 6.1 m/s e. 6.7 m/s
50 QuickCheck 9.4 A force pushes the cart for 1 s, starting from rest. To achieve the same speed with a force half as big, the force would need to push for A. s. B. s. C. 1 s. D. 2 s. E. 4 s. Slide 9-37
51 QuickCheck 9.4 A force pushes the cart for 1 s, starting from rest. To achieve the same speed with a force half as big, the force would need to push for A. s. B. s. C. 1 s. D. 2 s. E. 4 s. Slide 9-38
52 QuickCheck 9.5 A light plastic cart and a heavy steel cart are both pushed with the same force for 1.0 s, starting from rest. After the force is removed, the momentum of the light plastic cart is that of the heavy steel cart. A. greater than B. equal to C. less than D. Can t say. It depends on how big the force is. Slide 9-39
53 QuickCheck 9.5 A light plastic cart and a heavy steel cart are both pushed with the same force for 1.0 s, starting from rest. After the force is removed, the momentum of the light plastic cart is that of the heavy steel cart. A. greater than B. equal to C. less than Same force, same time same impulse Same impulse same change of momentum D. Can t say. It depends on how big the force is. Slide 9-40
54 QuickCheck 9.6 Two 1.0 kg stationary cue balls are struck by cue sticks. The cues exert the forces shown. Which ball has the greater final speed? A. Ball 1. B. Ball 2. C. Both balls have the same final speed. Slide 9-49
55 QuickCheck 9.6 Two 1.0 kg stationary cue balls are struck by cue sticks. The cues exert the forces shown. Which ball has the greater final speed? A. Ball 1. B. Ball 2. C. Both balls have the same final speed. Slide 9-50
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