Momentum and Impulse

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 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

NGSS.HS-PS2-2

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

Which of the following is true about an object of mass, m ₁ moving on a horizontal frictionless surface that strikes and sticks to an object of mass m₂ (m ₁ >m₂ )?

• The object m1 has greater momentum after the collision than before the collision.

• The object m2 has greater momentum after the collision then before the collision.

• Momentum is conserved during the collision.

• Kinetic energy is conserved during the collision.

Tags

NGSS.HS-PS2-2

Which of the following best describes impulse?

• The change in velocity of an object

• The change in momentum of an object

• The force applied to an object over a distance

• The energy transferred to an object

Tags

NGSS.HS-PS2-2

How does applying a larger force over a shorter time period affect the impulse delivered to an object?

• It decreases the impulse.

• It increases the impulse.

• It has no effect on the impulse.

• It changes the direction of the impulse.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 0.2 kg ball is thrown with a velocity of 15 m/s. What is the impulse required to stop the ball?

• 3 Ns

• 0 Ns

• 15 Ns

• 30 Ns

Tags

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

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 average force acting on the puck?

• 100 N

• 150 N

• 200 N

• 300 N

Tags

NGSS.HS-PS2-1