Unit 2 review! -Physical Science

Which of the following best describes static friction?

• The frictional force that opposes the motion of an object sliding over a surface.

• The frictional force that acts on objects that are not moving.

• The frictional force that acts on rolling objects.

• The frictional force that opposes the motion of an object through air.

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NGSS.MS-PS2-2

Which of the following factors does NOT affect the gravitational force between two objects?

• The mass of the objects

• The distance between the objects

• The volume of the objects

• The gravitational constant

According to Newton's first law of motion, what will happen to an object at rest if no external force is applied?

• It will start moving.

• It will remain at rest.

• It will accelerate.

• It will change direction.

A ball is thrown straight up into the air. At the highest point of its path, what is the ball's velocity and acceleration?

• Velocity is zero, acceleration is zero.

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NGSS.MS-PS2-4

Which of the following is an example of kinetic energy?

• A book sitting on a shelf

• A compressed spring

• A moving car

• A stretched rubber band

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NGSS.MS-PS3-1

What materials are necessary for magnetism to exist?

• Only non-metallic materials

• Only metallic materials

• Ferromagnetic materials like iron, nickel, and cobalt

• Any type of material

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NGSS.MS-PS2-3

A 5 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?

• 25 J

• 50 J

• 250 J

• 500 J

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NGSS.MS-PS3-1

How does the gravitational force between two objects change if the distance between them is doubled?

• It becomes four times stronger.

• It becomes twice as strong.

• It becomes half as strong.

• It becomes one-fourth as strong.

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NGSS.MS-PS2-5

NGSS.MS-PS3-2

Which of Newton's laws explains why you feel a push backward when you push against a wall?

• Newton's first law

• Newton's second law

• Newton's third law

• None of Newton's laws

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NGSS.MS-PS2-1