Momentum

The cart’s change of momentum is

1. –30 kg m/s.2. –20 kg m/s.3. –10 kg m/s.4. 10 kg m/s.5. 30 kg m/s.

The cart’s change of momentum is

1. –30 kg m/s.2. –20 kg m/s.3. –10 kg m/s.4. 10 kg m/s.5. 30 kg m/s.

1. The clay ball exerts a larger impulse because it sticks.

2. The rubber ball exerts a larger impulse because it bounces.

3. They exert equal impulses because they have equal momenta.

4. Neither exerts an impulse on the wall because the wall doesn’t move.

A 10 g rubber ball and a 10 g clay ball are thrown at a wall with equal speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall?

1. The clay ball exerts a larger impulse because it sticks.

2. The rubber ball exerts a larger impulse because it bounces.

3. They exert equal impulses because they have equal momenta.

4. Neither exerts an impulse on the wall because the wall doesn’t move.

A 10 g rubber ball and a 10 g clay ball are thrown at a wall with equal speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall?

Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?

1. vA > vC

2. vA = vC

3. vA < vC

Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?

1. vA > vC

2. vA = vC

3. vA < vC

An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?

1. Left end

2. Right end

An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?

1. Left end

2. Right end

1. vf is greater than v1.

2. vf = v1.

3. vf is less than v2.

4. vf = v2.

5. vf is greater than v2, but less than v1.

The two particles are both moving to the right. Particle 1 catches up with particle 2 and collides with it. The particles stick together and continue on with velocity vf. Which of these statements is true?

1. vf is greater than v1.

2. vf = v1.

3. vf is less than v2.

4. vf = v2.

5. vf is greater than v2, but less than v1.

The two particles are both moving to the right. Particle 1 catches up with particle 2 and collides with it. The particles stick together and continue on with velocity vf. Which of these statements is true?

1. increases.

2. decreases.

3. stays the same.

A dry ice (solid carbon dioxide) puck revolves in a circle on the end of a lightweight rigid rod that turns on frictionless bearings. A cushion of CO2 gas allows the puck to glide across the surface without friction. As the puck sublimates (changes from a solid to a gas), its speed

1. increases.

2. decreases.

3. stays the same.

A dry ice (solid carbon dioxide) puck revolves in a circle on the end of a lightweight rigid rod that turns on frictionless bearings. A cushion of CO2 gas allows the puck to glide across the surface without friction. As the puck sublimates (changes from a solid to a gas), its speed

1. a force that is applied at a random time.2. a force that is applied very suddenly.3. the area under the force curve in a

force-versus-time graph.4. the time interval that a force lasts.

Impulse is

1. a force that is applied at a random time.2. a force that is applied very suddenly.3. the area under the force curve in a

force-versus-time graph.4. the time interval that a force lasts.

Impulse is

The total momentum of a system is conserved

1. always.

2. if the system is isolated.

3. if the forces are conservative.

4. never; it’s just an approximation.

The total momentum of a system is conserved

1. always.

2. if the system is isolated.

3. if the forces are conservative.

4. never; it’s just an approximation.

In an inelastic collision,

1. impulse is conserved.

2. momentum is conserved.

3. force is conserved.

4. energy is conserved.

5. elasticity is conserved.