Newton's 3rd Law Mini-Lesson

Newton's 3rd Law of Motion

6.7C- identify simultaneous force pairs that are equal in magnitude and opposite in direction that result from the interactions between objects using Newton’s Third Law of Motion.

Multiple Choice

Newton’s law states that for every action, there is an ________ reaction.

• unequal and opposite

• equal and similar

• stronger and opposite

• equal and opposite

Multiple Choice

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.

Multiple Choice

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• The cannon moving backwards

• The cannonball moving backwards

• The cannonball moving forward

Multiple Choice

How is this an example of Newton’s Third law?

• Only the ball is using the head

• They are both exerting an equal force on each other

• Only the head is pushing the ball

Multiple Choice

When a small car pushes a big truck, the truck applies an equal and opposite force on the car.

• False

• True

Multiple Choice

This image illustrates Newton's third law. Newton's third law simply states that for every action there is an equal and ______ reaction.

• opposite

• greater

• equal

• weaker

Multiple Choice

When a heavy football player and a light one run into each other, who exerts more force

• The light one

• Their force are equal

• The heavy one

Multiple Choice

Arrows are often used to show the strength and direction of forces. Which of the following pairs of arrows shows equal and opposite forces?

• A

• B

• C

• D

Multiple Choice

Arrows are often used to show the strength and direction of forces. Which of the arrows shown here would result in no net movement of an object because the forces are equal and opposite?

• A

• B

• C

• D

Multiple Choice

How is this an example of Newton's 3rd Law?

• Only the head is pushing on the ball

• Only the ball is using the head

• Both the ball and the head are exerting equal force on each other

Multiple Choice

Forces always come in __________.

• Pairs

• Triplets

• Waves