Summative _ Impulse-Momentum Basics

The law of conservation of momentum states that, 

• p before is less than the p after
• p before is the same as the p after
• p before is more than the p after

The units for Impulse are

• N/s
• N-s
• N
• m/s

A bug flies into the windshield of a car going the opposite way. Which of the following are true.

• the force of impact is the same for both
• the impulse is the same for both
• the acceleration of the bug is larger than the truck
• A, B, and C are all true

Momentum is a ____________________ quantity

• science
• scalar
• vector
• energy

The momentum of an object depends upon the object's ___________&_____________.

• size and shape

• mass and speed

• mass and veloctiy

• mass and energy

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N s.

• -2.5

• -10

• -18

• -45

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 40-kilogram mass is moving across a horizontal surface at 5.0 m/s.  What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?

• 1 N
• 40 N
• 25 N
• 5 N

A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?

• 6030 kg
• 0.0134 kg
• 74.4 kg
• 80 kg

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• 66 N·s

• None of these