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If a container of dried beans with a table tennis ball at the bottom is shaken, what happens to the CG of the container?

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Physics

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4 years ago

Date created

Mar 1, 2020

Cards (20)

Section 1

(20 cards)

If a container of dried beans with a table tennis ball at the bottom is shaken, what happens to the CG of the container?

Front

The CG falls because the tabletennis ball rises above the beans. It has a less dense mass.

Back

What accounts for the stability of the Space Needle is Seattle?

Front

The Space Needle is stable because the CG is below the ground.

Back

How far can an object be tipped before it topples over?

Front

An object can be tipped until the CG is outside the base of support.

Back

What part of an object follows a smooth path when the object is made to spin through the air or across a flat smooth surface?

Front

The center of gravity follows the smooth path

Back

Why is the CG of a baseball bat not at its midpoint?

Front

There is more mass at the end of the bat.

Back

Why do you spread your feet farther apart when standing in a bumpy-riding bus?

Front

By spreading your feet you increase the width of your base this increases you stability.

Back

What happens to the CG of a glass of water when a table tennis ball is poked beneath the surface?

Front

The CG of the water rises as the ping pong ball is forced below the surface.

Back

What is suggested by a star that wobbles of center?

Front

A star wobbles because there are planets circling the star. Their gravity causes the star to wobble

Back

Is the gravitational potential energy more, less, or unchanged when the CG of an object is raised?

Front

The Potential Energy of an object is increased when the CG rises.

Back

When are the CG and center of mass of an object the same? When can the CG and center of mass be different?

Front

The CG and the CM are the same when the density of the object is homogenous. When this is not true, then they are not the same.

Back

How is balancing the pole end of a broom in an upright position on the palm of your hand similar to the launching of a rocket?

Front

An object can be tipped until the CG is outside the base of support.

Back

Why does the Leaning Tower of Pisa not topple?

Front

The CG is still inside the base of the tower

Back

Cite an example of an object that has a CG where no physical material exists.

Front

Any object that is hollow, curved or angular.

Back

Why is it easier to hang by your arms below a supporting cable than to do handstands on a supporting floor?

Front

When hanging the CG is below the support but while doing a handstand the CG is above the support

Back

Why can you not successfully bend over and touch your toes when you stand with your heels against the wall?

Front

By standing against the wall you cannot change your CG. This causes you to topple forward

Back

Front

Neutral change in position does not cause a rise or fall of the CG. Stable change in postion causes a rise in the CG Unstable change in position causes a fall in the CG.

Back

Describe the motion of the CG of a projectile, before and after the object explodes in mid air

Front

The center of gravity follows a parabolic path both before and after it explodes.

Back

How can the CG of an irregularly shaped object be determined?

Front

CG can be determined by suspending the object and marking the plumb line. Repeat for two or three more points to find CG.

Back

Why do some high jumpers arch their bodies into a U shape when passing over the high bar?

Front

By arching their bodies they cause the CG to be lower than their body.

Back

What is the "secret" of balancing toys that exhibit stable equilibrium while appearing to be unstable?

Front

Balancing toys are stable because the CG is below the support.

Back