Third Law

Action-reaction forces never cancel each other out because....

• they act on different objects

• they act on the same object

• they do not act on objects

Which Newton's Law best describes this statement, for every action there is an equal and opposite reaction?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

Tags

NGSS.MS-PS2-1

Newton's 3rd Law of Motion states...

• An object at rest will remain at rest unless acted upon by an outside force and causes a change in motion

• Force is equal to the mass and acceleration of an object.

• For every action there is an equal and opposite reaction.

• An object in motion will remain in motion at a constant speed and same direction unless an unbalanced force causes a change in motion.

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NGSS.MS-PS2-1

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.

• Every mass exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

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NGSS.MS-PS2-1

Which description best identifies the action-reaction pair between the bird and the fence post?

• Action: The force of the bird on the wires

  Reaction: The force of the wires on the fence post

• Action: The force of the wires on the fence post

  Reaction: The force of the fence post on the bird

• Action: The force of the fence post on the bird

  Reaction: The force of the bird on the wires

• Action: The force of the bird on the post

  Reaction: The force of the fence post on the bird

Tags

NGSS.MS-PS2-1

Which statement best describes an action-reaction force pair in this statement?

• The friction of the ice decreases as the blade of the skate moves on the ice.

• The wall pushes on the skater as the skater pushes on the wall.

• The ice skates slow down, and the skater stops

• The skaters exerts a force on the wall, and blade exerts a force on the ice.

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NGSS.MS-PS2-1

A student kicks a soccer ball. According to Newton's 3rd law, what is the "reaction" in this situation

• The soccer ball flies off into the air

• You can hear the soccer ball being kicked

• The soccer ball exerts a force back on the student's foot

• Other students chase after the soccer ball

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NGSS.MS-PS2-1

A student drops a basketball onto the floor. According to Newton's 3rd law, why does the ball bounce?

• The student dropped the ball

• The earth pulls the ball down

• The ball presses down on the floor

• The floor presses up on the ball

Tags

NGSS.MS-PS2-1

A soccer ball breaks through a window. How does the force on the window compare with the force on the ball?

• The ball experiences a greater force

• The window experiences a greater force

• The window and ball experiences forces equal in magnitude

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NGSS.MS-PS2-1

A bug hits into the windshield of a car. How do the forces on the bug and windshield compare?

• The force on the bug is greater

• The force on the windshield is greater

• The forces on the bug and windshield are equal in magnitude.

Tags

NGSS.MS-PS2-1