Impulse-Momentum with Graphs

• –20 kg m/s

• -10 kg m/s

• 0 kg m/s

• 10 kg m/s

• 30 kg m/s

A force pushes the cart for 1 s, starting from rest. To achieve the same speed with a force half as big, the force would need to push for

• 1/4 s

• 1/2 s

• 1 s

• 2 s

• 4 s

A light plastic cart and a heavy steel cart are both pushed with the same force for 1.0 s, starting from rest. After the force is removed, the

momentum of the light plastic cart is ________ that of the heavy steel cart.

• greater than

• equal to

• less than

• can't say; depends on how big the force is

You awake in the night to find that your living room is on fire. Your one chance to save yourself is to throw something that will hit the back of your bedroom door and close it, giving you a few seconds to escape out the window. You happen to have both a sticky ball of clay and a super-bouncy Superball next to your bed, both the same size and same mass. You’ve only time to throw one. Which will it be? Your life depends on making the right choice!

• Throw the superball.

• Throw the ball of clay.

• It doesn't matter. Throw either.

A mosquito and a truck have a head-on collision. Splat! Which has a larger change of momentum?

• the mosquito

• the truck

• they have the same change in momentum

• can't say without knowing their initial velocities

The two boxes are on a frictionless surface. They had been sitting together at rest, but an explosion between them has

just pushed them apart. How fast is the 2-kg box going?

• 1 m/s

• 2 m/s

• 4 m/s

• 8 m/s

• not enough info given

The impulse is ______ the change in momentum

• Greater than
• Equal to
• less than
• always double

• Force will increase

• Force will decrease

A fan cart is allowed to run on a track. A remote control is used to turn the fan cart on and off.

Do you see a mathematical relationship between force, time, and the final momentum? What is it?

• force + time = final momentum

• force / time = final momentum

• force * time = final momentum

• force = time * final momentum

A fan cart is allowed to run on a track. A remote control is used to turn the fan cart on and off. The graph on the left shows velocity-vs-time.

Which experiment had the fan on for the longest time?

• Experiment 3

• Experiment 1

• Experiment 2

• All the same