Momentum

Momentum

Open Ended

Padding helmets and mouthguards can protect athletes. How does the equipment do this? When two objects collide, which quantities affect the outcome? Will a large elephant like an elephant, always cause more damage than a smaller one, like a pebble? Does speed or contact time play a role? As you think about these questions, list what you know about momentum.

Open Ended

What would you want to know about momentum?

Impulse-Momentum Theorem

​p=mv

Multiple Choice

What are the units for momentum?

• m/s2

• kg*m/s2

• kg*m/s

• kg/s

Multiple Choice

Which has the greatest momentum?

• a 75kg person sitting still

• a 5kg ball moving at 40 m/s

• a 25kg wagon moving at 5m/s

• a 10kg dog running at 15 m/s

• The impulse-momentum theorem states that the impulse on an object is equal to the change in its momentum.

Multiple Choice

A 2200 kg vehicle traveling at 26m/s can be stopped in 21s by gently applying the brakes. It can be stopped in 3.8s if the driver slams on the brakes, or in 0.22s if it hits a concrete wall. What is the initial momentum?

• 546 kg*m/s

• 46,200 kg*m/s

• 57,200 kg*m/s

Multiple Choice

A 2200 kg vehicle traveling at 26m/s can be stopped in 21s by gently applying the brakes. It can be stopped in 3.8s if the driver slams on the brakes, or in 0.22s if it hits a concrete wall. Using the initial momentum, what would be the force needed to stop the vehicle if the driver gently applies the brakes?

• 15,053N

• 2,724N

• 260,000N

Multiple Choice

A 2200 kg vehicle traveling at 26m/s can be stopped in 21s by gently applying the brakes. It can be stopped in 3.8s if the driver slams on the brakes, or in 0.22s if it hits a concrete wall. Using the initial momentum, what would be the force needed to stop the vehicle if the driver slams on the brakes?

• 15,053N

• 2,724N

• 260,000N

Multiple Choice

A 2200 kg vehicle traveling at 26m/s can be stopped in 21s by gently applying the brakes. It can be stopped in 3.8s if the driver slams on the brakes, or in 0.22s if it hits a concrete wall. Using the initial momentum, what would be the force needed to stop the vehicle stops by hitting the wall?

• 15,053N

• 2,724N

• 260,000N