force - a push or pull, energy transfer - movement of energy from one object to another, equal forces - forces acting together on an object, does NOT change its motion (balanced), unequal forces - forces that cause an object to start, stop, or change its motion (unbalanced), gravity - noncontact force that pulls objects, friction - contact force between surfaces that slows objects or stops them from moving, motion - movement , greater - more than, spring scale - tool to measure force in Newtons, pattern of motion - a predictable way of moving that repeats (Ex: friction ALWAYS slows or stops motion),

C6L1: Equal and Unequal Forces (5.7A)

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