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Law of Gravitation

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Questions and Answers

What did Isaac Newton realize about the force acting on the planets and the moon?

The same gravitational force is responsible for the motion of all these objects (correct)

Each object is affected by a different force

The moon is not affected by any force

The planets are not affected by any force

What causes an object to change its speed or direction of motion?

Magnetic force

Frictional force

Electric force

Gravitational force (correct)

What made Newton start thinking about the force of gravity?

An earthquake

The fall of an apple near him (correct)

The motion of the moon

A flash of lightning

What did activity 9.1 involving a stone on a thread demonstrate about motion?

The stone follows a circular path due to a centripetal force Signup and view all the answers

What factor does the force between two objects depend on, according to the universal law of gravitation?

The product of their masses Signup and view all the answers

How is the constant of proportionality in the universal law of gravitation defined?

G = Force / (Mass × Distance) Signup and view all the answers

How did Henry Cavendish determine the value of the universal gravitation constant, G?

By using a sensitive balance Signup and view all the answers

What is the SI unit of the universal gravitation constant, G?

N m^2/kg^2 Signup and view all the answers

What does the law of gravitation state about the force of attraction between two objects?

It is directly proportional to the product of their masses Signup and view all the answers

Why does a heavy object not fall faster than a light object, even though gravitational force acts on all objects in proportion to their masses?

Because the acceleration due to gravity is higher for lighter objects Signup and view all the answers

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?

$6.64 \times 10^{−11}$ N Signup and view all the answers

What happens to the force of gravitation between two objects when the distance between them is reduced to half?

It becomes four times the original force Signup and view all the answers