______ is a contact force that opposes the motion of an object.

________ is a noncontact force that pulls on metal objects containing iron.

_______ is a noncontact force that pulls objects toward Earth.

_________ is the pull of gravity on an object.

________ is the amount of matter in an object.

An object will move ________ when you push it harder.

Smooth surfaces cause less friction. Rough surfaces cause_______ friction.

Balanced forces _________.

Same poles of a magnet ________.

opposite poles of a magnet_______.

Which object would attract to the magnet?

If you traveled to the moon your weight would ________.

Your mass on another planet will_______.