Newton's Laws of Gravity

The gravitational force exerted by an object depends on its

• volume.

• weight.

• mass.

• size.

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NGSS.MS-PS2-4

Complete this sentence by choosing the correct second part of the sentence: As distance increases between objects...

• gravitational force increases

• gravitational force stays the same

• gravitational force decreases

• the size of the object increases

Planets X and Y orbit each other in space. Which changes would have the greatest effect on increasing the gravitational attraction between the two planets?

• doubling the mass of planet X and halving the distance between the planets

• halving the mass of planet X and doubling the distance between the planets

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NGSS.MS-PS2-4

The gravitational force on an object on the surface of the Moon is 1/6 that of the gravitational force on the same object on the surface of Earth. Why is the gravity acting on the object on the Moon less than the gravity acting on the object on Earth?

• because the distance from Earth to the object has increased

• because the mass of the Moon is less than the mass of Earth

• because Earth is rotating at a faster rate than the Moon is rotating

• because the pull on the object from Earth counteracts the pull from the Moon

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NGSS.MS-PS2-4

• This is an example of Newton's First Law.
• This is an example of Newton's Second Law.
• This is an example of Newton's Third Law.

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NGSS.MS-PS2-1

What is the formula for Newton’s 2nd law of motion?

• F = ma

• E = mc^2

• V = IR

• P = IV

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NGSS.MS-PS2-2

• This is an example of Newton's First Law.
• This is an example of Newton's Second Law.
• This is an example of Newton's Third Law.

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NGSS.MS-PS2-2

Which of the following is an example of an unbalanced force?

• A book resting on the table.

• A pencil that is knocked to the ground.

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NGSS.MS-PS2-2

What is Newton's 1st Law?

• For every action there is an equal and opposite reaction.

• An object at rest will stay at rest, an object in motion will stay in motion, unless an unbalanced force acts upon it.

Suppose an Astronaut floating in space throws a rock. What will happen to the rock?

• It will continue to move in the same direction, speeding up as it moves.

• It will continue to move at the same speed and in the same direction until it is acted upon by another force.

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NGSS.MS-PS3-1