does heat EXPAND or SHRINK metal?

It's all relative.

Make it hotTER and it will expand.

Make it coolER and it will shrink.

Does Heat Expand Or Contract

Yes - the general rule is that metals expand on heating and contract on cooling - however there are exceptions.

As another person answered - Antimony actually expands slightly as it solidifies from the molten state. Because of this property it was used as a constituent of type metal - as the molten metal cooled it expanded slightly and gave a sharper definition to the type that had just been cast.

What about polymers? I saw an example of a polymer motor with strips of polymer on plastic cups making a motor turning the cups obviously with heat and cold making the polymer strips heavier or lighter under the sun or in the shade. Most comments said heating shrunk the polymer and cooling in the shaded side expanded the polymer. Using a hair dryer to shrink a plastic film full of wrinkles on a window heats the plastic then when it cools it contracts to fit the window making it wrinkle free. Ice in copper tubing expands the copper to a breaking point (hence: bursting pipes with freezing tempretures).

Heat expands metal and cold shrinks it.

Most metals expand when heated and contract when cooled. This is often explained using the kinetic molecular theory; when you add heat, it gives the metal atoms more kinetic energy so that they can move farther apart. As it happens, antimony and bismuth, and some of their alloys, do contract on heating and expand on cooling, but this is the exception, not the rule. (Also: gallium expands as it is heated but contracts when it melts.)

Metals expand on heating and contract on cooling. This happens because each molecule can vibrate more when it's given (heat) energy.

You are right, heat causes metal to expand, cold contracts it.

It expands on heating and contracts on cooling. There are some exceptions but this is degree level.

Metals expand when hotter.

Heat = energy = Electrons moving around more & needing more space

Heat expands metal and it also loosens the atoms, which makes it less brittle and easier to use. An example of this would be heating copper over a fire to make it stronger, more malleable, and more ductile.