Front

Push or pull on an object.

Back

force

Front

When multiple forces act on an object and are the same.

Back

balanced force

Front

More than one force acts on an object, with one force greater than the others.

Back

unbalanced force

Front

Object changes location

Back

motion

Front

A force that pulls objects towards Earth.

Back

gravity

Front

A force that occurs when 2 objects touch and slows down moving things.

Back

friction

Front

All are simple machines EXCEPT:

Back

mailbox

Front

This photo is an example of a simple machine:

Back

inclined plane (ramp)

Front

This photo is an example of a simple machine.

Back

wheel and axle

Front

Threads on the base and twisting force indicate this simple machine.

Back

screw