Chapter 7 Gravitation

According to Newton's law of gravitation, the Earth and the Moon are gravitationally attracted to each other. The more massive Earth attracts the Moon with...

• a stronger force than the Moon attracts the Earth.

• a weaker force than the Moon attracts the Earth.

• the same force as the Moon attracts the Earth.

• a force that is sometimes stronger and other times weaker than the Moon attracts the Earth.

Two factors effecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass

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The gravitational force between two bodies of masses m₁ and m₂ are separated by distance r is F. State the effect on the gravitational force when m₁ increases twice.

• 2F

• 1/2 F

• 4F

• 4F

The picture shows two identical satellites, A and B, in circular orbits around the Earth. Upon which satellite does the Earth exert a stronger gravitational force?

• Satellite A

• Satellite B

• Equal on both

• Cannot be determined

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The gravitational force between two bodies of masses m₁ and m₂ are separated by distance r is F. State the effect on the gravitational force when distance between two bodies increases twice.

• 2F

• 1/2 F

• 1/4 F

• 4F

An apple is placed in the Earth's gravitational field. Which of the following best explains why the apple falls to the ground?

• The field exerts a gravitational force upon the apple.

• The Earth exerts a gravitational force upon the apple.

• Masses attract each other.

• On Earth, all objects fall with acceleration 9.8 m/s².

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What happen to the gravitational acceleration to an object if the object is moving from surface of the planets to the outer space?

• increases

• decreases

• unchanged

• increase, then decrease

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Which of the following is true about geostationary satellite?

• Above different geographical location.

• The orbital period is longer than 24 hours.

• It does not experience any gravitational pull

• Its period of rotation is one day.

The gravitational force between two masses is

• always attractive

• zero when a third mass placed between them

• inversely proportional to their distance

• directly proportional to the sum of the two masses

An exploratory robot was sent to the planet Mars. The gravity on Mars is weaker than the gravity on Earth. Compared to the mass and weight of the robot on Earth, the robot on Mars has...

• less mass and weight.
• less mass but equal weight.
• equal mass and weight.
• equal mass but less weight.

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