Action and Reaction Pairs Newton's Third Law of Motion

A bus hits a bug and the bug splatters on the windshield, which force is greater?

• The Bus
• The Bug
• They're the same
• Gravity acting on the bus

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-1

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 at 9.8 m/sec²    

• 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

Tags

NGSS.MS-PS2-2

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.

Tags

NGSS.MS-PS2-1

When gravity pulls a skydiver towards the Earth, the reaction force is...

• The skydiver pulling the Earth.
• Air resistance
• The weight of the skydiver
• Drag

Tags

NGSS.MS-PS2-4

What force stops your foot slipping on the ground when you walk?

• Gravity
• Kinetic energy
• Friction
• Upthrust

An object is moving at a constant velocity. What can you say about the forces on it?

• They are unbalanced
• They are balanced
• They are all acting in the same direction
• There cannot be any forces on it

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The measure of the pull of gravity on an object is ___________________.

• motion
• weight
• speed
• friction

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

Tags

NGSS.MS-PS2-1

A 500 Kg cannon fires a 5 Kg cannonball.  Which object experiences the greatest force?

• The cannon
• The cannonball
• The forces are equal and opposite.
• Not possible to determine

Tags

NGSS.MS-PS2-1