The Law of Gravity

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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Choose the correct formula of Newton's law of gravity

$F \sim \frac{m_1 \cdot m_2}{d^3}$

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

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

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

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Explain the formula of Newton's law of gravity

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

(1) transparent is the force of gravity between two objects

(2) transparent means "is proportional to"

(3) transparent is the mass of one of the objects

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

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$\sim$

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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?

There is no force between me and the computer or mobile phone

The masses involved are so small that the force is very small

Newton's law does not apply to these types of objects

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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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If the distance between the two objects is tripled, the force becomes ______ as great

$\frac13$

$\frac{1}{12}$

$\frac19$

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If the distance is made four times as great, the force of gravity is what fraction of its original value?

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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?

It becomes 25 times greater

It becomes 1 times greater

It becomes 24 times greater

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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?

$\frac12$

$\frac13$

$\frac14$

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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?

Greater

Less

No change

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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?

less far

more far

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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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