Physics 201 Exam Pt. 2

When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam undergoes

• tension

• compression

• either of these

• neither of these

An athlete can perform a certain number of pushups. The same athlete scaled up in size can do

• fewer pushups

• the same number of pushups

• more pushups

Which has more skin compared to its body weight?

• an elephant

• a mouse

• both the same

If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their

• initial momentum

• maximum height

• time of travel

• acceleration

• none of the above

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

• lengthened time of contact

• shorter time of contact

• decreased impulse

• increased momentum

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of contact about 10 times that of a stiff-legged landing. In this way, the average force your body experiences from impact is

• less than 1/10 as great

• more than 1/10 as great

• about 1/10 as great

• about 10 times as great

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the

• force against the cannon is smaller than against the ball

• momentum is mainly concentrated in the cannonball

• cannon has much more mass than the cannonball

• momentum of the cannon is smaller

As Bronco Brown steps off a hovering high-flying helicopter and falls through the air, he experiences

• an impulse

• an increasing speed

• a decreasing acceleration

• all of the above

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard

• decreases

• increases

• neither decreases nor increases

Freddy Frog drops vertically from a tree onto a horizontally moving skateboard. The reason he doesn't slip off the skateboard is due to

• inertia in motion

• momentum change

• friction between his feet and the board