Lesson 10 - force pairs and gravitational force

What is Newton's Third Law of Motion?

• an object at rest stays at rest, and an object in motion will stay in motion until an outside force acts upon it

• the acceleration of an object will be equal to the net force of an object divided by its mass

• for every action, there will be an equal and opposite reaction

• an object that is not moving will stay not moving moving until an unbalanced force acts on it

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Forces always act in equal and opposite pairs.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

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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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The amount of matter in an object.

• Weight

• Gravity

• Volume

• Mass

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All objects in the universe have a gravitational attraction to each other. 

• True
• False

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What is the strongest force on Earth?

• Gravity

• Friction

• Air Resistance

• Love

A book is at rest on a table. Check all the forces that act on it.

• gravity

• normal force

• applied force

• friction

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If you push on a wall with a force of 30 N, the force acting on you from the wall is which of the following?

• 0 N

• 10 N

• 20 N

• 30 N

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Based on Newton's third law of motion, when a person on a skateboard throws a heavy

concrete block to the north, the person will be pushed to the____

• north

• south

• stay still

• west

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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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