Momentum and Impulse

What are the two factors that affect the momentum of an object?

• speed and velocity

• time and mass

• distance and displacement

• mass and velocity

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

Momentum is a ____________________ quantity

• science

• scalar

• vector

• energy

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. The railroad car is brought to a sudden stop while the boxcar moves away from the collision. At what speed will the second boxcar move?

• 18.6 m/s

• 9.3 m/s

• 7.5 m/s

• 1.86 m/s

What would happen to the momentum of a toy car if the mass is doubled and the velocity decreases by 1/2?

• It decreases by 1/4

• It decreases by 1/2

• Stays the same

• It is doubled

Momentum is conserved in this type of collision

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

A track athlete throws a discus that has a momentum of 42kg*m/s into a field with a velocity of 21 m/s. What is the mass of the discus?

• 1 kg

• 2 kg

• 3 kg

• 4 kg

The Law of Conservation of Momentum states:

• The total momentum before a collision is equal to the total momentum after a collision.

• The total momentum before a collision is greater than the total momentum after a collision.

• The total momentum before a collision is less than the total momentum after a collision.

• The total momentum before a collision is not related to the total momentum after a collision.

A 2-kg Rubber Ball with an Initial Speed of 10 m/s Bounces off a Wall. Immediately After the Bounce, the Ball Has a Speed of 5 m/s. What Is the magnitude of the ball's change in momentum? Pay attention to direction.

• 10 kg m/s

• 20 kg m/s

• 30 kg m/s

Jen (50 k g) and David (75 k g), Both on Rollerblades, Push off Each Other Abruptly. After the Push, Jen Has a Velocity of −3.0 m/s. What Is David’s Velocity?

• + 2.0 m/s

• + 3.0 m/s

• + 4.5 m/s