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),

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