GRAVITATION Physics Form 4

According to the Newton’s Universal Law of Gravitation, the force of gravity between two objects is directly proportional to

• The distance between the objects.

• The product of the masses of the objects.

• The gravitational constant.

• The square of the distance between the objects.

According to the Newton’s Universal Law of Gravitation, the force of gravity between two objects is inversely proportional to

• the distance between the objects.

• the product of the masses of the objects

• the gravitational constant

• the square of the distance between the objects

What is the reason for the motion of the Moon on its orbit?

• The gravitational force exerted on the Earth by the Moon.

• The gravitational force exerted by the Sun.

• The gravitational force exerted by the Planets.

• The gravitational force exerted on the Moon by the Earth

A satellite moves around the earth in its orbit and does not escape from the space because the satellite

• becomes weightless

• move in a vacuum.

• always pulled by the earth gravitational force.

• move with highest speed.

Diagram show a model car moving with the direction shown by the arrow around a horizontal circular track. The car travels too quickly and leaves the track at point P. Which direction A, B, C or D shown the correct path of the car?

• A

• B

• C

• D

The value of universal gravitational constant G depends on

• The nature of material of two bodies.

• The heat content of two bodies.

• The acceleration of two bodies.

• None of these.

What keeps an Earth satellite moving in its orbit?

• A Gravitational attraction of Sun.

• Burning of fuel.

• Ejection of gases from the exhaust of the satellite.

• Gravitational attraction between satellite and Earth.

A satellite moves around the Earth in its orbit and does not escape from the space because the satellite

• Become weightless

• Move in vacuum

• Always pulled by the Earth gravitational force

• Move with highest speed

“A force that make an object to follow a circular path with direction always towards the center of curvature.” Statement above is the definition of

• Gravitational force

• Escape force

• Centripetal force

• Gravitational field strength

What happen to the weight of the object if the mass of the Earth decreases one-half from its original mass without changing its radius?

• Does not change

• Decreases to one half from original weight

• Decreases to one quarter from original weight

• Increases double from original weight