Newton's 3rd law of motion

Newton's third law states that any action will have a(n) _______ and ______ reaction

• Equal and similar
• Equal and opposite
• Equal and different
• Greater and opposite

A book rests on a table.  The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward ?   

• The table presses back up on the book with an equal and opposite force of 20 newtons.
• The table presses back up on the book with a force greater than 20 newtons.
• The table and the book together are accelerating downwards at  9.8 m/sec²
• The inertia of the book holds it up

You hit a wall with a stick.  The equal but opposite reaction is _____

• the wall pushes against you
• the stick pushes against you
• you push against the stick
• the wall pushes against the stick

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

• The cannon moving forward
• The cannonball moving forward
• The cannon moving backward
• The cannonball moving backward

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.

What is not an example of Newton's Third Law?

• Two people pushing against each other with the same force and in opposite directions
• You have to push a heavy ball harder to move as fast as a smaller one
• When you sit on a chair, your body acts as a force on the chair, and the chair acts as another force holding your body up

Newton's _____ Law of Motion means that for every force there is a reaction force that is equal in size, but opposite in direction.

• First
• Second
• Third
• Fourth

Complete the law:

For every action, there is an ____________ reaction.

• equal and opposite

• equal

• opposite

• bigger and better

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow
• the arrow's push against the bowstring
• the grip of the archer's hand on the bow

Every time your cat’s paw hits her toy string, it swings away from her. How does this demonstrate Newton’s third law of motion?

• Objects with mass, such as your cat's paw and toy string, will require inertia

• Objects in action, such as the string toy, will experience force.

• For every motion from your cat's paw, there is unbalanced inertia form the string

• For every action your cat makes, there is an equal and opposite reaction from the string.