physics chapter 6

a piece of putty moving w 1 unit of momentum strike and sticks ti a heavy bowling ball that is initially at rest. both move with a combines momentum of

1 unit

the speed of a 4 kg ball w a momentum of 12 kg m/s is

3 m/s

it is correct to say that impulse is equal to

a corresponding change in momentum

a heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. compared w the force that stops the car the force needed to stop the same truck is

greater

padded dashboards in cars are safer in an accident than a non padded ones because passengers hitting the dashboard encounter

lengthened time of contact

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

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

twice