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# McC 8 ESL Physics

### Force, Motion, Newton's Laws

TermDefinition
Acceleration Change in velocity divided by the amount of time needed for that change to take place; occurs when an object speeds up, slows down or changes directions
Balanced Force Describes forces that are equal but opposite in directions; cancel each other out and no change in motion occurs
Displacement Measures the distance and direction from a starting point to an ending point
Distance The entire path an object travels
Force A push or a pull; has a size and direction
Friction Any force that resists motion
Gravity Force of attraction between all objects in the universe
Inertia An object’s tendency to remain at rest or keep moving with constant velocity
Speed Distance traveled divided by the time needed to travel that distance; Speed = Distance/Time
Unbalanced Forces Unequal forces acting on an object – results in a change in the object’s motion in the direction of the larger force
Velocity Speed and direction of a moving body
Newton's 1st Law An object will remain at rest or move in a straight line with constant speed unless acted upon by an unbalanced force
Newton's 2nd Law An object acted upon by an unbalanced force will accelerate in the direction of the force; Force = Mass X Acceleration
Newton's 3rd Law Forces always act in equal but opposite pairs; Action and Reaction Pair example: bat touches ball and ball touches bat
Created by: MCJH