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# Physics Unit Review

### Vocabulary for Physics Unit Test

QuestionAnswer
energy transfer energy transfers from one form to another
mechanical energy potential energy and kinetic energy combined in lifting, stretching, bending
radiant energy energy that can travel through space in waves (such as the sun - radiation)
nuclear energy energy stored in the nucleus of every atom, extremely powerful, and comes from certain elements such as uranium
thermal energy total energy of all particles of an object, depending on the temperature of the object
chemical energy energy released during a chemical reaction
sound energy energy you can hear
Law of Conservation of Energy the idea that energy can change from one form to another, but cannot be created or destroyed
Newton's Law #1 Every object at rest stays at rest; every object in motion stays in motion until another force acts on it. Law of Inertia
Newton's Law #2 Amount of force needed to change the speed of an object depends on the mass of the object. Principle of of Accelerated Motion
Newton's Law #3 To every action there is an opposite and equal reaction. Forces come in pairs called action-reaction pairs.
acceleration change in velocity (direction, speed or both)
inertia an object's resistance to a change in motion
speed distance divided by time it took for motion to occur (distance/time)
velocity speed with direction
energy the ability to do work
potential energy energy that is stored (not moving)
kinetic energy energy in motion
balanced forces combined forces create a net force of zero (object does not move)
unbalanced forces combined forces create a net force greater than zero (object moves)
force push or a pull
net force the sum (+) or difference (-) of all of the forces acting on an object
friction a force that resists the movement of an object
Created by: mharlan

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