Newton's Third Law

According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -

• the mass of the skateboard is the same as the mass of the person jumping off.

• the pull of gravity on the person is the same as on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• for the force that sent the person forward, there is an equal force pushing back on the skateboard.

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NGSS.MS-PS2-1

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, same direction

• 200 Newtons, opposite direction

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NGSS.MS-PS2-1

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust.

• Burned fuel can be collected on the ground.

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward.

• This allows the rocket to be steered properly.

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NGSS.MS-PS2-1

The head of a hammer is often made of steel. This makes the head heavy, which helps create a strong force for driving nails. Steel is also strong. The head of a hammer must be strong to resist what force?

• The force of the air resistance on the moving hammer

• The force of the person using the hammer

• The force of gravity pulling down on the hammer

• The force of the nail pushing in the opposite direction

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A child kicks a soccer ball with a force of 65 newtons. What is the force exerted by the ball on the child's foot, and what is its direction?

• 65 newtons; opposite direction

• 65 newtons; same direction

• 130 newtons; opposite direction

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NGSS.MS-PS2-1

_______ is always equal and opposite to the action force

• Motion

• Force

• Reaction

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NGSS.MS-PS2-1

Two metal spheres are suspended on wires so that they hang next to each other, just touching. Sphere X is raised to a certain height and released. Without friction or air resistance, describe what would happen to Sphere Y.

• Sphere Y would swing out in the opposite direction (to the right) to the same original height as Sphere X.

• Sphere Y would swing out in the same direction (to the left) to the same original height as Sphere X.

• Sphere Y would stop sphere X

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NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-1

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

Tags

NGSS.MS-PS2-1

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

Tags

NGSS.MS-PS2-1