AP Physics Momentum

A rocket of mass m begins to ascend vertically at v m/s. The work that gravity does on the rocket is:

• Negative

• Zero

• Positive

• Undefined

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NGSS.HS-PS2-4

A hockey stick strikes a 0.50 kg puck and is in contact with the puck for t = 0.050s. The puck travels in a straight line as it approaches and leaves the hockey stick after it is struck. The puck arrives at the stick with a velocity of 6.4 m/s and leaves with a velocity of -3.6 m/s. What is the magnitude of the average force acting on the puck?

• 100 N

• 150 N

• 200 N

• 300 N

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

A car of mass m is moving with a momentum p. How would you represent its kinetic energy in terms of these two quantities?

• p ² /2m

• ½ p ² m

• pm

• pm/2

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NGSS.HS-PS2-2

A 3 kg ball is dropped onto a concrete floor. What is the magnitude of the ball’s change in momentum if its speed just before striking the floor is 7 m/s and its rebound speed is 3 m/s?

• 10 kg-m/s

• 15 kg-m/s

• 30 kg-m/s

• 60 kg-m/s

Tags

NGSS.HS-PS2-2

A 3.0 kg toy truck moves freely along a track at 2.0 m/s and collides with a 1.0 kg toy car that is at rest. After the collision, the two cars stick together. What is their velocity after the collision?

• 1.5 m/s

• 2.0 m/s

• 2.5 m/s

• 3.0 m/s

Tags

NGSS.HS-PS2-2

A hockey stick strikes a 0.50 kg puck and is in contact with the puck for t = 0.050s. The puck travels in a straight line as it approaches and leaves the hockey stick after it is struck. The puck arrives at the stick with a velocity of 6.4 m/s and leaves with a velocity of -3.6 m/s. What is the magnitude of the change in momentum of the puck?

• 2 kg-m/s

• 3 kg-m/s

• 10 kg-m/s

• 5 kg-m/s

Tags

NGSS.HS-PS2-1

A carpenter is initially at rest on an icy pond when he decides to throw his hammer. After being thrown, the hammer moves in one direction while the carpenter moves off in the opposite direction. Which of the following correctly describes this activity?

• The carpenter and the hammer will have the same kinetic energy.

• The hammer will have a greater magnitude of momentum.

• The carpenter will have a greater magnitude of momentum.

• The carpenter and the hammer will have equal and opposite momentum.

Tags

NGSS.HS-PS2-2

A 40.0 kg physics student at rest on a frictionless rink throws a 3.0 kg box, giving the box a velocity of 8.0 m/s. Which statement describes the initial velocity of the student after the box is thrown?

• 0.6 m/s in the same direction as the box.

• 0.6 m/s in the opposite direction of the box.

• 1.7 m/s in the same direction as the box.

• 1.7 m/s in the opposite direction of the box.

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NGSS.HS-PS2-1

NGSS.HS-PS2-2

A rubber ball with a mass of 0.25 kg and a speed of 9.0 m/s collides perpendicularly with a wall and bounces off with a speed of 11 m/s in the opposite direction. What is the magnitude of the impulse acting on the rubber

ball?

• 0.5 kg-m/s

• 2 kg-m/s

• 5 kg-m/s

• 20 kg-m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 10,000.0 kg trolley moving at 4.0 m/s collides and couples with a 6000.0 kg trolley which is initially at rest. The final speed of the trolleys is:

• 0.5 m/s

• 1.0 m/s

• 2.0 m/s

• 2.5 m/s

Tags

NGSS.HS-PS2-2