Final Exam Review

Momentum is ___ in motion.

• Velocity

• Acceleration

• Inertia

• Impulse

Momentum is mass times ___.

• Acceleration

• Motion

• Velocity

• Impulse

If only the velocity of an object increases, its momentum ___.

• Increases

• Decreases

• Neither

Which has more momentum, a large truck moving at 30 km/hr or a small truck moving at 30 km/hr?

• Both have the same momentum

• The large truck

• The small truck

Compared to a sports car moving at 30 mph, the same sports car moving at 60 mph has ___ momentum.

• Four times as much momentum

• Three times as much momentum

• Twice as much momentum

• The same amount of momentum

Impulse equals ___.

• Mass times velocity

• The sum of forces acting on a body

• The difference in final and initial momentum

• Instantaneous momentum

Ball A collides with ball B. The force ball A exerts on ball B is _____ compared to the force ball B exerts on ball A.

• Is equal in magnitude and opposite in direction

• Is less in magnitude and opposite in direction

• Is equal in magnitude and acts in the same direction

• Is not equal in magnitude

A car traveling along the highway needs a certain amount of force to stop. More stopping force may be needed when the car has _____.

• More momentum

• More mass

• Less stopping distance

• All of the above

When you jump off a step, you usually bend your knees as you reach the ground. By doing this, the time of impact is about 10 times more. Compared to a stiff-legged landing, the average force on your body is reduced by _____.

• More than 15 times

• About 10 times

• Less than 5 times

• It is actually more

The law of conservation of momentum states that _____.

• Momentum equals the product of force over a time interval

• That energy cannot be created or destroyed

• A force moving an object a certain distance has momentum

• Net momentum before the collision equals the net momentum after