FT - PHYSICS 1 Long Quiz #2

A 2-kg cart moving at 3 m/s collides with a wall and comes to a complete stop. What is the impulse exerted on the cart by the wall?

• 6 N·s

• -6 N·s

• 1.5 N·s

• -1.5 N·s

Which of the following situations best demonstrates the concept of impulse?

• A rocket accelerating in space.

• A book resting on a table.

• A tennis player following through after hitting a ball.

• A satellite orbiting Earth.

Which of the following will increase the momentum of an object?

• Decreasing the time of impact.

• Increasing the force applied for the same time.

• Reducing the mass of the object.

• Decreasing the velocity.

A baseball is hit with a bat, changing its momentum from -10 kg·m/s to 30 kg·m/s. What is the impulse delivered by the bat?

• 20 N·s

• -20 N·s

• 40 N·s

• 30 N·s

If the time of contact between a moving object and a surface is increased, the average force exerted on the object will:

• Increase

• Stay the same

• Decrease

• Become zero

A moving truck has more momentum than a motorcycle because:

• It is larger in size.

• It moves faster.

• It has greater mass and possibly higher velocity.

• It has greater volume.

Which of the following quantities is always conserved in collisions, provided there is no external force?

• Kinetic energy

• Potential energy

• Momentum

• Impulse

In a car crash, airbags reduce injuries by:

• Increasing the mass of the passenger

• Increasing the velocity of the passenger

• Increasing the time over which momentum changes

• Decreasing the momentum

What is the unit of momentum?

• N·s

• kg·m/s²

• kg·m/s

• m/s²

Which of the following statements is true about impulse?

• It is independent of force.

• It depends only on velocity.

• It is equal to the product of mass and acceleration.

• It is equal to the change in momentum.