Force - the push or pull on an object with mass, Newtons (N) - a unit of force; what force is measured in, Balanced Force - a force where the object stays still or continues moving at the same speed and in the same direction, Unbalanced Force - a force that changes the position, speed or direction of the object to which it is applied, Net Force - to total force acting on an object, Spring Scale - a tool used to measure how much force is acting on an object, Friction - a force that opposes motion, Gravity - pulls on objects without actually touching them, Normal Force - the support force exerted upon an object that is in contact with another stable object,

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