Momentum and Energy Pretest

What two things must an object have in order to have momentum?

• speed and velocity

• impulse and volume

• mass and weight

• mass and velocity

The equation to calculate momentum is:

• P = mg

• P = mv

• P = mgh

• P = ½ mv^2

Which has more momentum: a truck stopped at a stoplight or a bike and rider moving at 6 m/s?

• the truck

• the bike

• they are equal

• cannot be determined with the information given

How much momentum does a 150-kg deer have if it is moving at 5 m/s southward?

• 0.03333333 kgm/s, south

• 30 kgm/s, south

• 155 kgm/s, south

• 750 kgm/s, south

A runner has a momentum of 720 kgm/s and is traveling at a velocity of 5 m/s, what is the runner’s mass?

• 14.4 kg

• 144 kg

• 1400 kg

• 3750 kg

A 0.030-kg bullet is fired at a velocity of -350 m/s out of a gun with a mass of 0.9 kg. What is the recoil velocity of the gun?

• 9.0 m/s

• 10.0 m/s

• 10.5 m/s

• 11.7 m/s

A 9-kg blob moving at 5 m/s collides and sticks to a stationary 5-kg blob. What will be the post-collision velocity of the combined blob?

• 3.21 m/s

• 3.57 m/s

• 9.9 m/s

• 11.34 m/s

Momentum is a __________________________ quantity.

• scalar

• stationary

• vector

• energy

A boy kicks a football with a force of 20 Newtons and the force acts for a time of 0.3 seconds. The impulse on the ball was:

• 1 N*s

• 6 N*s

• 33.3 N*s

• 66.7 N*s

What is the definition of impulse? (Select all that apply!)

• J = F * t

• J = F *d

• change in momentum

• change in energy