Physics Exam 2: Momentum

When the force that produces an impulse acts for twice as much time, the impulse is

doubled

The greater the impulse exerted on something, the greater?

change in momentum

What is impulse?

change of momentum

When the speed of an object is doubled, its momentum

doubles

When you are in the way of a fast-moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a

long time

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

move away from each other, but at different speeds

Conservation of Momentum

zero

The monkey throws his hat, what is the net momentum of the Monkey-hat system now?

It is still zero because of the law of conservation of momentum

don't confuse force with impulse. force causes an _____, and impulse is the ____ _ _____.

acceleration, change of momentum

What is the momentum of a 4kg ball traveling at 30 m/s? (mxv)

120 kg m/s

One golfer does not follow through and is in contact with the ball for only .1 sec. Another golfer does follow through and is contact for .3 sec. How does the velocity of the second golfer's ball compare (assuming same force)?

Three times as fast

When a dish falls, will the change in momentum be less if it lands on a carpet than if it lands on a hard floor? (Careful!)

no, both are the same

Suppose you have a gun made from a strong, but very light material, fires a bullet that is more massive than the gun itself. For such a weapon

the target is safer than the shooter