1.)Two balls are dropped from the same height. One is a heavy bowling ball, whil
ID: 1777043 • Letter: 1
Question
1.)Two balls are dropped from the same height. One is a heavy bowling ball, while the other is a rather light tennis ball. Which of the two balls has the larger momentum just before it hits the ground?
2.)Two cars, one twice as heavy as the other, are at rest on a horizontal track. A person pushes each car for 5 s. Ignoring friction and assuming equal force exerted on both cars, the momentum of the light car after the push is
-Smaller than that of the heavier car.
-Larger than that of the heavier car.
-The same as that of the heavier car.
3.)Two cars, one twice as heavy as the other, are at rest on a horizontal track. A person pushes each car for the same distance. Ignoring friction and assuming equal force exerted on both cars, the momentum of the light car after the push is
-less than the heavier car.
-Larger than that of the heavier car.
-The same as that of the heavier car.
Explanation / Answer
1)both balls reach with same velocity because g is constant in that direction for both masses.
there fore the larger mass having larger momentum than lighter mass.
2)In the second case force and time of application is same for both cars therefore impulse is same and the impulse is equal to change in momentum.
so both cars having same momentum.
3) work is same here because w=F.S
work done is equal to kinetic energy =p2/2m
p2= constant * m
therefore the heavier car having higher momentum.
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