Newton's Laws and Gravitational Force

Two asteroids exert a gravitational force, F, on each other. Some time later, the asteroids are now three times as far from each other as before. Which of the following represents the gravitational force at this distance? 

• F/3
• F/2
• F/6
• F/9

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Luke Skywalker has a mass of 13 kg and weight of 127.4 N on earth. Find his weight on the Endor moon. Acceleration on Endor due to gravity is 2 m/s/s.

• 254.8 N
• 13 kg
• 26 N
• 127.4 kg

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The amount of matter in an object

• mass
• weight
• inertia
• gravity

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What states that "every object in the universe attracts every other object"?

• Law of Universal Gravitation
• Newton's First Law of Motion
• My mother
• Inertia & gravity

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Which of the following is Newton's Law on Gravitation?

• F=Gm₁m₂/r
• F = Gm₁m₂/r²
• F = Gm₁m₂/2r
• F = m₁m₂/2r

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The moon and other satellites rotate around the earth. Identify the force that keeps these satellites in orbit.

• gravity
• friction
• a strong force
• electromagnetic force

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Why did Newton think that there was a force acting on the moon?

• Because the moon always keeps one side toward Earth
• Because the moon moves in a curved path
• Because there is no air on the moon
• Because the moon is moving

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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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Gravity attracts all objects towards one another.

• False
• True
• It depends
• I don't care

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Any object with mass is surrounded by a gravitational field.

• True
• Fallse
• False
• Tru

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