Force, A push or pull that one object puts on another object with or without direct contact (friction, gravity, etc), Balanced forces, Forces that are equal in size but opposite in direction (object does NOT move), Unbalanced forces, Unequal forces in size and may/may not be opposite in direction (object moves in direction of greatest force), Friction, A force between two surfaces rubbing against each other, Gravity, A force that pulls an object toward Earth, Electric force, When a force attracts or repels of electric charges., Magnetic force, Force that attracts iron, nickel, steel and lodestone (doesn't attract brass, gold, silver), Attract, A force (opposite poles) that pulls or draws closer to each other, Repel, force (same poles) that push away or apart, North/South poles, opposite magnetic poles on a magnet (and on Earth)

Force

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