# Often asked: When Your Car Travels Rapidly Over A Bump In The Road, You Suddenly Feel Weightless. Explain?

## In what way does the string of a bow and arrow behave like a spring quizlet?

In what way does the string of a bow and arrow behave like a spring? The restoring force is proportional to the string’s distortion. As you wind the mainspring of a mechanical watch or clock, why does the knob get harder and harder to turn? The mainspring obeys Hooke’s Law.

## When an airplane starts its propellers they spin slowly at first and gradually pick up speed Why does it take so long for them to reach their full rotational speed?

When an airplane starts its propellers, they spin slowly at first and gradually pick up speed. Why does it take so long for them to reach their full rotational speed? They have a large rotational mass. You just studied 102 terms!

## When two trains are traveling side by side at breakneck speed it’s still possible for people to jump from one train to the other explain why this can be done safely?

When two trains are traveling side by side at breakneck speed, it’s still possible for people to jump from one train to the other. Explain why this can be done safely. Because the trains’ relative velocity is zero, a person jumping between them views them both as essentially stationary.

## When using a hammer to drive a nail into wood you have to swing the hammer through the air with a certain velocity because the hammer has both mass and velocity it has momentum describe what happens to the hammer’s momentum after the hammer hits the nail what scientific principle?

When using a hammer to drive a nail into wood, you have to swing the hammer through the air with a certain velocity. Because the hammer has both mass and velocity, it has momentum.

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## Why does it hurt less to land on a soft foam pad than on bare concrete after completing a high jump?

Why does it hurt less to land on a soft foam pad than on bare concrete after completing a high jump? Answer: The foam pad will act as a spring plus shock absorber. Much of the kinetic energy of you falling will go into deforming the pad and not into liquefying your bones. On the other hand, concrete does NOT deform.

## Why is your weight reading best show when you stand at rest on the scale?

Why is your weight reading best shown when you stand still? 71. Only when you are in equilibrium will the support force on you correctly show your weight. Then it is equal to the force of gravity on you.

## Why does tapping your toothbrush on the sink dry it off?

According to Newton’s first law, an object in motion will stay in motion will stay in motion unless acted on by an outside force. When you tap your toothbrush on the sink, the sink stops the toothbrush, but not the water drops, causing them to keep going off the toothbrush making it dry.

## Why is falling onto a pile of leaves more comfortable than falling onto a hard concrete floor?

Falling into a leaf pile is much more comfortable than falling onto the bare ground. It takes more time to come to rest falling in a leaf pile, so the stopping force is less.

## When you start your computer the hard disk begins to spin it takes 6 seconds of constant angular acceleration to reach full speed at which time the computer can begin to access it if you wanted the disk drive to reach full speed in only 2?

It takes 6 seconds of constant angular acceleration to reach full speed, at which time the computer can begin to access it. If you wanted the disk drive to reach full speed in only 2 seconds, how much more torque would the disk drive’s motor have to exert on it during the starting process? Three times as much torque.