Newton's 3rd Law

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, opposite direction

• 200 Newtons, same direction

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NGSS.MS-PS2-1

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust.

• Burned fuel can be collected on the ground.

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward.

• This allows the rocket to be steered properly.

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NGSS.MS-PS2-1

This is always equal and opposite to the action force

• Motion

• Collide

• Force

• Newton's 3rd Law

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NGSS.MS-PS2-1

The illustration shows the forces in Newtons (N) acting on three different blocks. Which blocks will move under these conditions?

• Blocks 1 and 2

• Blocks 2 and 3

• Blocks 1, 2, and 3

• Blocks 1 and 3

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A push or pull that can change an object’s motion

• Force

• Motion

• Reference Frame

• Direction

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NGSS.MS-PS2-2

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips. The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

• More wire was needed to wrap around the spoon.

• The spoon now picks up seven paper clips.

• Eventually the battery runs out of energy.

• The ends of the wire must touch the battery's poles.

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NGSS.MS-PS2-3

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The tendency to pull other objects toward it

• Magnitude

• Attraction

• Repulsive

• Current

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NGSS.MS-PS2-4

An astronaut way out in space is considered to be “weightless" This is because–

• his mass is so small relative to the earth that gravity doesn't affect him.

• gravitational force decreases greatly over long distances.

• gravitational force pushes objects away from each other at long distances.

• objects far away from the earth have less mass.

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NGSS.MS-PS2-4

Which of the following does not affect the gravitational force between the earth and the sun?

• The mass of the earth

• The mass of the sun

• The distance between the earth and the sun

• The net electrical charge of the earth

Tags

NGSS.MS-PS2-4

The force between two masses

• Gravitational force

• Force

• Mass

• Interacting objects

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NGSS.MS-PS2-4

NGSS.MS-PS2-5