Newton's Third Law

When a gymnast performs, which force is most important in determining how high they jump?

• the downward force of gravity

• the friction exerted by the ground

• the action force that the gymnast exerts on the ground

• the reaction force of the ground

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which term is a force that can slow momentum?

• mass

• inertia

• friction

• acceleration

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NGSS.MS-PS2-2

The law of conservation of momentum states that the total momentum of a group of objects

• increases after a collision

• decreases after a collision

• remains the same after a collision

• will double after a collision

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NGSS.MS-PS2-1

A person kicks a soccer ball with a force to 250 Newtons. What is the force and direction exerted by the ball on the persons foot?

• 250 Newtons, same direction

• 250 Newtons, opposite direction

• 500 Newtons, same direction

• 500 Newtons, opposite direction

Tags

NGSS.MS-PS2-1

Why do astronauts in space weight less than they do on Earth?

• There is less air to cause resistance in space.

• The distance from Earth decreases their mass.

• The distance from Earth weakens Earth’s gravitational pull on them.

• The friction between astronauts and Earth is greater on Earth’s surface.

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NGSS.MS-PS2-4

Forces pairs act in opposite directions and are the same strength.

• true

• false

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NGSS.MS-PS2-1

Forces in a force pair never cancel each other.

• true

• false

Tags

NGSS.MS-PS2-1

In a force pair, one force is the action force, and the other force is the second force.

• true

• false

Tags

NGSS.MS-PS2-1

According to Newton’s third law, when an object applies a force on a second object, the second object applies a weaker reaction force in response.

• true

• false

Tags

NGSS.MS-PS2-1

Objects that affect one another

• collide

• interacting objects

• motion

• force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2