Lesson 3: Force Pairs

Which of the following defines Newton's 3rd law?

• Objects in motion remain in motion unless acted upon by an outside force.

• Acceleration depends on the mass of an object and the force applied to it.

• When an object applies a force on another object, the second object applies a force of the same strength on the first object, but in the opposite direction.

• The weight of an object depends on it's mass and the gravitational pull.

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The forces in a force pair are in the _______ direction

• opposite

• same

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Forces always act in equal and opposite pairs.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

Which of the following demonstrates Newton's 3rd law?

• A drone with a strong engine is able to accelerate faster than a drone with a weak engine.

• If a drone runs out of battery, it will fall until something, like the ground, stops it.

• A light drone is able to go faster than a heavy drone.

• In order to fly, a drone pushes air down while the air pushes the drone up.

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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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A baseball player bats a ball with a force of 1,000 N. The ball exerts a reaction force (without any additional forces action on it) against the bat of...

• Less than 1, 000 N

• 1,000 N in the same direction

• More than 1,000 N

• 1,000 N in the opposite direction

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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

When a bug hits the windshield of a car, the force of the car on the bug equals the force of the bug on the car.

• True

• False

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NGSS.MS-PS2-1