Newton's Third Law of Motion gk

force

For every action ______________ there is an equal and opposite reaction ___________. (one word)

size

Magnitude means (size/direction).

equal

In every action-reaction force pair, the FORCES are _______ in size (magnitude).

direction

In every action-reaction force pair, the forces are equal in magnitude, but opposite in ________.

3rd

Law of action-reaction is Newton's _______ law of motion

pairs

Forces always occur in ________, groups of two.

simultaneously

The action-reaction forces occur ___________ (at exactly the same time)

same time

simultaneous means exactly at the___________ __________

action-reaction

Newton's 3rd Law of Motion is also called the law of ___________.

magnitude

In Newton's 3rd law of motion, the forces are equal in __________

2000 N

A smart car runs into a huge pickup truck with 2000 N of force. The truck hits the little smart car with __________ of force

gases

A rocket launches (pushes) off of its own

400 N

A 90 kg box runs into a 20 kg box with 400 N of force. The 20 kg hits the 90 kg box with _______ of force.

mass

The amount of matter an object is made of is its __________

kg

The SI unit of mass

N

The SI unit of weight (because weight is a force)

weight

The pull of gravity on an object's mass defines __________

gravity

Weight is a force because something has weight only due to _________

False

Weight and mass are the same thing. True or False

opposite

In action-reaction force pairs, the forces are always in the _________ direction.

2

In this picture, the man in the middle is involved in how many force pairs?

contact

To find force-pairs, look for the points of ______.

foot

In kicking a soccer ball, the action-reaction is foot on ball, ball on ________.