Newton's Third Law

Newton's Third Law States...

• Objects in motion stay in motion and objects at rest stay at rest
• Force is equal to mass times acceleration
• For each action there is an equal and opposite reaction

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NGSS.MS-PS2-1

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow
• the arrow's push against the bowstring
• the grip of the archer's hand on the bow

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NGSS.MS-PS2-1

A player throws a ball. The action force is the player impact on the ball. The reaction force is...

• The force of the ball impact on the player
• The force of the grip of the ball
• The celebration the player is thinking of

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NGSS.MS-PS2-1

A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction force is...

• The grip of the player's hands on the ball
• the air resistance of the ball
• the force of the ball against the bat

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NGSS.MS-PS2-1

What is the reaction force to a foot pushing down on the floor?

• The foot going through the floor
• The floor pushing back against the foot
• The floor breaking to the foot

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NGSS.MS-PS2-1

According to Newton's third law forces come in pairs?

• True
• False

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NGSS.MS-PS2-1

A dog plays with a ball. Consider the action force the dog touching the ball. What is the reaction force?

• The friction of the ground on the ball.

• The ball pushing the ground.

• The ground pulling the dog.

• The ball touching the dog.

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NGSS.MS-PS2-1

An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is

• larger.

• the same.

• smaller

• need more information to say.

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NGSS.MS-PS2-1

If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?

• Yes, because there is a net force acting on the wagon.

• Yes, because there is a time delay between action and reaction.

• No, because the forces cancel each other.

• Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be

• the small car

• the large truck

• neither, both are the same.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2