Momentum
Impulse
Collisions
Random
100
Which is a unit of momentum?
A) N-m/s2
B) kg-m/s2
C) N-m/s
D) kg-m/s
D) kg-m/s
100
An air bag is used to safely decrease the momentum of a driver in a car accident. The air bag reduces the magnitude of the force acting on the driver by
A) increasing the length of time the force acts on the driver
B) decreasing the distance over which the force acts on the driver
C) increasing the rate of acceleration of the driver
D) decreasing the mass of the driver
A) increasing the length of time the force acts on the driver
100
Ball A of mass 5.0 kilograms moving at 20. meters per second collides with ball B of unknown mass moving at 10. meters per second in the same direction. After the collision, ball A moves at 10. meters per second and ball B at 15 meters per second, both still in the same direction. What is the mass of ball B?
A) 6.0 kg
B) 2.0 kg
C) 10. kg
D) 12 kg
C) 10. kg
100
A golf club hits a stationary 0.050-kilogram golf ball with an average force of 5.0 × 103 newtons, accelerating the ball to a speed of 44 meters per second. What is the magnitude of the impulse imparted to the ball by the golf club?
A)
B)
C)
D)
A)
200
Daily Double!
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200
A 3.0-kilogram object is acted upon by an impulse having a magnitude of 15 newton•seconds. What is the magnitude of the object’s change in momentum due to this impulse?
A) 5.0 kg•m/s
B) 15 kg•m/s
C) 3.0 kg•m/s
D) 45 kg•m/s
B) 15 kg•m/s
200
A 3.1 kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?
A) 0.0 m/s
B) 2.4 m/s
C) 7.5 m/s
D) 500. m/s
B) 2.4 m/s
200
Car A has a mass of 2 kilograms and a speed of 3 meters per second. Cart B has a mass of 3 kilograms and a speed of 2 meters per second. Compared to the inertia and magnitude of momentum of cart A, cart B has
(A) the same inertia and a smaller magnitude of momentum.
(B) the same inertia and the same magnitude of momentum.
(C) greater inertia and a smaller magnitude of momentum.
(D) greater inertia and the same magnitude of momentum.
(D) greater inertia and the same magnitude of momentum.
300
What is the momentum of a 1,200-kilogram car traveling at 15 meters per second due east?
A) 1.8 × 104 kg•m/s due east
B) 1.8 × 104 kg•m/s due west
C) 80. kg•m/s due east
D) 80. kg•m/s due west
A) 1.8 × 104 kg•m/s due east
300
In a baseball game, a batter hits a ball for a home run. Compared to the magnitude of the impulse imparted to the ball, the magnitude of the impulse imparted to the bat is
(A) greater
(B) less
(C) the same
(C) the same
300
At the circus, a 100.-kilogram clown is fired at 15 meters per second from a 500.-kilogram cannon. What is the recoil speed of the cannon?
A) 75 m/s
B) 15 m/s
C) 3.0 m/s
D) 5.0 m/s
C) 3.0 m/s
300
Daily Double!
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400
A 6.0-kilogram block, sliding to the east across a horizontal, frictionless surface with a momentum of 30. kilogram • meters per second, strikes an obstacle. The obstacle exerts an impulse of 10. newtons • seconds to the west on the block. The speed of the block before the collision is
(A) 1.7 m/s
(B) 5.0 m/s
(C) 3.3 m/s
(D) 20. m/s
(B) 5.0 m/s
400
A 0.45-kilogram football traveling at a speed of 22 meters per second is caught by an 84- kilogram stationary receiver. If the football comes to rest in the receiver’s arms, the magnitude of the impulse imparted to the receiver by the ball is
(A) 1800 N•s
(B) 9.9 N•s
(C) 4.4 N•s
(D) 3.8 N•s
(B) 9.9 N•s
400
The diagram below represents two masses before and after they collide. Before the collision, mass mA is moving to the right with speed v, and mass mB is at rest. Upon collision, the two masses stick together.
Which expression represents the speed, v', of the masses after the collision? [Assume no outside forces are acting on mA or mB.]
A)
B)
C)
D)
D)
400
A 2.0 kilogram toy cannon is at rest on a frictionless surface. A remote triggering device causes a 0.005 kilogram projectile to be fired from the cannon. Which equation describes this system after the cannon is fired?
(A) mass of cannon + mass of projectile = 0
(B) velocity of cannon + velocity of projectile = 0
(C) momentum of cannon + momentum of projectile = 0
(D) speed of cannon + speed of projectile = 0
(C) momentum of cannon + momentum of projectile = 0
500
The magnitude of the momentum of an object is 64.0 kilogram•meter per second. If the velocity of the object is doubled, the magnitude of the momentum of the object will be
A) 32.0 kg•m/s
B) 64.0 kg•m/s
C) 128 kg•m/s
D) 256 kg•m/s
C) 128 kg•m/s
500
A bicycle and its rider have a combined mass of 80. kilograms and a speed of 6.0 meters per second. What is the magnitude of the average force needed to bring the bicycle and its rider to a stop in 4.0 seconds?
(A) 1.2 x 102 N
(B) 3.2 x 102 N
(C) 4.8 x 102 N
(D) 1.9 x 103 N
(A) 1.2 x 102 N
500
A block initially at rest on a frictionless horizontal surface is struck by a bullet moving with horizontal velocity .
What is the velocity of the bullet-block system after the bullet embeds itself in the block?
D)
500
Which situation will produce the greatest change of momentum for a 1.0-kilogram cart?
A) accelerating it from rest to 3.0 m/s
B) accelerating it from 2.0 m/s to 4.0 m/s
C) applying a net force of 5.0 N for 2.0 s
D) applying a net force of 10.0 N for 0.5 s
C) applying a net force of 5.0 N for 2.0 s