Gravity - a noncontact force that pulls objects toward the center, Energy transfer - The movement of energy from 1 object to another.  , Friction - a force between surfaces that slows objects or stops them, Equal forces - forces that act together on an object without changing its motion., Unequal forces - Forces that cause an object to change its motion.  , Interaction - To have contact with something through touch or actions.  , Test - to find out the nature or quality of something, to prove a hypothesis, Evidence - to prove or disprove something with facts., Experimental Investigation - test in which a control is identified and variables are measured to test a hypothesis, Control - the variable in an experiment that remains unchanged, Hypothesis - a prediction that can be tested., Force - A push or a pull; changes the state of rest or the state of motion, Variable - what is being tested or changed in an experiment,

Force and Motion

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