Newton's Laws

A hovercraft is speeding up as it moves to the right.

Which one of the free body diagrams below best represents the forces acting on it?

• A

• B

• C

• D

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NGSS.MS-PS2-2

Look carefully at the free body diagram on the left.

Which of the following statements can you conclude from it?

• The object is accelerating

• The object is expanding, stretched up and down and left and right

• The object is stationary

• The object has a constant velocity

According to Newton's third law of motion, every force is paired with a reaction force that acts:

• on the same object in the same direction

• on the same object in the opposite direction

• on a different object in the same direction

• on a different object in the opposite direction

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NGSS.MS-PS2-1

A jet ski shoots a jet of water backwards. The force on the jet of water is paired with a reaction force, as described by the third law of motion.

Compared to the force on the jet of water, the reaction force:

• is weaker

• is a different type

• acts on a different object (the jet ski)

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NGSS.MS-PS2-1

In 1972 on the Apollo 16 mission, astronaut Charles Duke left a family photo on the surface of the Moon. Which one of the following statements is true?

• The Moon is much smaller than the Earth, so exerts no gravitational force on the photo

• The Moon exerts a gravitational force on the photo, but the photo does not exert a gravitational force on the Moon

• The Moon and photo both exert gravitational forces on each other, but the force applied by the Moon to the photo is much greater

• The Moon and photo exert equal and opposite gravitational forces on each other

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NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

The net force acting on an object is equal to:

• its weight times its velocity

• its mass divided by its acceleration

• its mass times its velocity

• its mass times its acceleration

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NGSS.MS-PS2-2

If the force is kept constant. The mass of the object is ___________ to the acceleration.

• Directly proportional

• Inversely proportional

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NGSS.MS-PS2-2

Inertia is an object's tendency to:

• fall to the ground

• slow down and stop

• maintain a constant velocity

• maintain a constant acceleration

"For every action, there is an equal and opposite reaction."

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Newton's 4th Law

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NGSS.MS-PS2-1

What does the first part of Newton’s first law say about objects in motion?

• Objects in motion speed will increase.

• Objects in motion speed will decrease.

• Objects will move at the same speed and direction unless force changes their motion.

• Force does not affect the change in an objects motion.