Momentum and Impulse Review

Which of the following describes the Law of Momentum Conservation?

• The total momentum of a system remains constant

• The total momentum of a system changes over time

• The total momentum of a system is always zero

• The total momentum of a system cannot be negative

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum
• Skater 2 experiences a greater change in momentum
• Skater 1 has a greater velocity than Skater 2
• Skater 1 experiences a greater force

An egg is thrown at a wall and at a bed sheet. The egg's change in velocity will be

• Greater for the wall collision
• Greater for the sheet collision
• Change in velocity is equal

Momentum is conserved in this type of collision

• elastic
• inelastic
• momentum is conserved in both types of collisions

In an elastic collision, ______ is conserved.

• Momentum only

• Kinetic Energy only

• Both momentum and energy

The impulse-momentum theorem states that

• the impulse on an object is equal to the change in momentum it causes 
• the force on a moving object is equal to the magnitude of the impulse.
• the impulse on an object is greater than the change in momentum it causes 
• the impulse on an object is less than the change in momentum it causes

A spring is compressed between two objects with unequal masses, m and M, and held together. The objects are initially at rest on a horizontal frictionless surface. When released, which of the following is true?

• The total final kinetic energy is zero.
• The two objects have equal kinetic energy.
• The speed of one object is equal to the speed of the other.
• The total final momentum of the two objects is zero.

An open cart on a level surface is rolling without frictional loss through a vertical downpour of rain. As the cart rolls, an appreciable amount of rainwater accumulates in the cart. The speed of the cart will

• increase because of conservation of mechanical energy
• decrease because of conservation of momentum
• decrease because of conservation of mechanical energy
• remain the same because the raindrops are falling perpendicular to the direction of the cart's motion

A ball of mass m with speed v strikes a wall at an angle θ with the normal, as shown. It then rebounds with the same speed and at the same angle. The impulse delivered by the ball to the wall is

• mv sin θ
• mv cos θ
• 2mv sin θ
• 2mv cos θ

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

• Perfectly Inelastic Collision

• No collision occurred