U2.25 Checkpoint #6

Which of the following best states Newton's third law of motion?

• An object at rest stays at rest unless acted on by an outside force.

• The acceleration of an object is dependent on its mass and the force applied to it.

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

• Energy cannot be created or destroyed, only transferred.

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NGSS.MS-PS2-1

A swimmer pushes water backward with her hands. What is the reaction force?

• The water pushing the swimmer forward.

• The swimmer's feet kicking the water.

• The force of gravity pulling the swimmer down.

• The air pushing against the swimmer's back.

Tags

NGSS.MS-PS2-1

You are sitting in a chair. Your body exerts a downward force on the chair. What is the corresponding reaction force?

• The floor pushing up on the chair.

• The chair pushing up on your body.

• The force of gravity pulling you down.

• Your weight being distributed on the chair.

The Earth exerts a gravitational force on the Moon. What is the reaction force according to Newton's third law?

• The Sun's gravitational force on the Earth.

• The Moon's gravitational force on the Earth.

• The Moon's orbit around the Earth.

• The force of friction in space.

Tags

NGSS.MS-PS2-1

A bird flies by pushing its wings down against the air. What is the reaction force that pushes the bird up?

• The bird's weight pulling it down.

• The bird's wings pushing down on the air.

• The air pushing up on the bird's wings.

• The forward motion of the bird.

According to Newton's third law, forces always occur in...

• isolation.

• pairs.

• threes.

• the direction of motion.

Tags

NGSS.MS-PS2-1

When you walk, you push backward on the ground with your foot. What force actually pushes you forward?

• The force of you pushing backward.

• The force of gravity.

• The force of the ground pushing forward on your foot.

• The force of air resistance.

Tags

NGSS.HS-PS2-1

A cannon fires a cannonball. The cannon recoils (moves backward) after firing. This recoil is an example of...

• Newton's first law.

• Newton's second law.

• Newton's third law.

• The law of conservation of energy.

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NGSS.MS-PS2-1

A tiny beetle collides with the windshield of a fast-moving bus. Which of the following statements is true about the forces during the collision?

• The beetle exerts a larger force on the bus.

• The bus exerts a larger force on the beetle.

• The beetle and the bus exert equal-sized forces on each other.

• Neither one exerts a force on the other.

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NGSS.MS-PS2-1

Following the collision between a beetle and a bus, why is the beetle's motion changed so much more dramatically than the bus's motion?

• The bus was moving much faster than the beetle.

• The force on the beetle was much larger.

• The beetle has a very small mass compared to the bus.

• The bus is designed to be more aerodynamic.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2