Unit 8 - Momentum & Impulse

a 1500 g cantaloupe and a 76 g kiwi are rolling down a hill at the same speed. Which one has more momentum?

the cantaloupe

whether a car comes to a stop by crashing into a haystack or a brick wall, the impulse is...

the same

which has greater momentum, a 2.0 kg hockey puck moving east at 2.5 m/s or a 1.3 kg hockey puck moving south at 3.0m/s?

2.0 kg hockey puck

a 2000 kg car is moving at 20 m/s. what is its momentum?

40,000 kg*m/s

impulse or change in momentum, is defined as F*t, therefore the ____ you push and the ____ you push the more the momentum will be changed.

harder; longer

A car drives with its sunroof stuck open and it starts to rain heavily. Water quickly begins to accumulate inside the car. Assuming the car's velocity stays the same, its momentum will...

increase

what is the SI standard unit of momentum

kg*m/s

If you can't avoid being hit by a fast-moving object, you'll suffer a smaller contact force if you can extend that force over a

longer time

Momentum can be described as

mass in motion and inertia in motion

Which has more momentum, a truck at rest or a skateboard rolling down a hill?

skateboard rolling down a hill

When two pool balls in an isolated system collide, the overall momentum of the system

stays the same

Compared with falling on a stone floor, a coffee mug may not break when it falls on a carpeted floor because...

stopping time is longer on the carpet

two pool balls having the same mass and speed roll toward each other and experience an elastic collision. What is their combined momentum after they meet?

zero

impulse

change in momentum and equal to force x time

when the total momentum in a system does not change we say it is...

conserved

a freight train rolls along a track with considerable momentum. if it rolls at the same speed but has twice as much mass, its momentum is...

twice as much