# The Law of Gravity

Learn how gravity keeps the universe in balance
QUESTION OF
calculate
Questions #: 13
Time: 10 minutes
Pass Score: 80.0%
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#### Newton's law of gravity

Every object in the universe attracts every other object in the universe with a proportional to the objects' and inversely proportional to the square of the between their centers.

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power
force
weights
masses
distance
travel time
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#### Explain the formula of Newton's law of gravity

$F \sim \frac{m_1 \cdot m_2}{d^2}$

(1) is the force of gravity between two objects

(2) means "is proportional to"

(3) is the mass of one of the objects

(4) is the distance between the centers of the objects

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d
F
m
$\sim$
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#### Why do not you feel the force between you and the computer or mobile you are using now?

The Newton's law of gravity says that there is a force of gravity between every two objects, between you and the person next to you, and between you and a bus out on the street.

Why do not you feel the force between you and the computer or mobile you are using now?

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#### The relationship between the force and the distance

In the Newton's Law of Gravity, the force changes as the of the distance

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inversely
directly
square
cube
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#### Two objects move to be closer

Suppose two objects are initially 5 meters apart and then are moved to 1 meter apart.  How does the force of gravity between them change?

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#### Your weight on earth and beyond it

Your distance to the center of the earth is about 4000 miles when I am on the surface.  If you go to a height of 4000 miles above the surface of the earth, the force of gravity (your weight) then becomes what fraction of your present weight?

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#### Suppose you weigh 117 here on earth

How far from the center of the earth must you go to weigh 13 pounds?

Note: You distance to the center of the earth is about 4000 miles when you are on the surface

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#### Rises above the surface of earth

As one rises above the surface of earth, does the acceleration of gravity become greater or less?

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#### The first second

Does an object fall more or less far during the first second of fall if it is high above the earth compared to being at sea level?

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#### Suppose an object is 60 times as far from earth-center

Suppose an object is 60 times as far from earth-center as the earth's surface is from earth-center.  What fraction of 4.9 meters will the object fall in one second?

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