Physics Momentum and Impulse

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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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

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When the velocity of a moving object is quadrupled, which of the following is also quadrupled?

• Kinetic energy

• Momentum

• Potential energy

• Acceleration

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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.

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How long must a 60 N net force act to produce a change in momentum of

240 kg-m/s?

• 4 s

• 3 s

• 2 s

• 1 s

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A truck moves along a frictionless level road at a constant speed. The truck is open on top. A large load of gravel is suddenly dumped into the truck. The velocity of the truck:

• Increases.

• Remains the same.

• Decreases.

• Immediately goes to zero.

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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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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

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Two friends with mass 60.0 kg and 40.0 kg run directly toward each other with speeds 3.0 m/s and 2.0 m/s respectively. If they hold on to each other after they collide, their combined speed just after the collision will be:

• 0 m/s

• 1.0 m/s

• 1.6 m/s

• 2.0 m/s

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A small car and a large truck collide head-on and stick together. Which one has the larger momentum change?

• the car

• the truck

• they both have the same momentum change

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