GRAVITATION FORM 4

which are the following is Newton’s Law of gravitation ?

• $W=\frac{GMm}{r}$

• $F\ =\frac{GMm}{r^2}$

• $V\ =\sqrt{\frac{GM}{r}}$

• $g=-\ \frac{GM}{r}$

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State the definition of Gravitational field strength

• Gravitational force per unit time acting on a body at a point in a gravitational field

• The force between two bodies of mass M and m is directly proportional to the product of their masses

• Gravitational force per unit mass acting on a body at a point in a gravitational field

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Newtton's Law of Gravitation states a mangnitude of an attractive force between two point masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

what is it related to ?

• Newton's 1st Law of motion

• Newton's 2nd Law of motion

• Newton's 3rd Law of motion

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what is the unit for Gravitional Field strength,  $a_g\ =\frac{GM}{r^2}$  

•  $N\ kg\ ^{-1}$  

•  $J\ kg\ ^{-1}$  

•  $m\ s\ ^{-2}$  

•  $m\ s\ ^{-1}$  

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Newton said that any two masses will...

• combine into a larger mass.

• attract each other.

• create gravitational fields.

• push each other apart.

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The picture shows three objects gravitationally interacting with each other. Which object exerts the greatest force on object B?

• Object A

• Object C

• A and C exert an equal force on B

• Cannot be determined

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A massive object and a less massive object exert a gravitational force on each other. Which of the following picture correctly shows the magnitude and direction of the forces involved in this interaction?

• 
• 
• 
• 

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If the mass of Earth increased, with no change in radius, your weight would _____.

• increase also
• stay the same
• decrease

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Two objects move toward each other gravitationally. As they get closer, the force between them:

• remains constant
• increases
• decreases

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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.

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