## Physics

##### Created by:

langleyclass  on April 25, 2011

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# Physics

 forcea push or pull on an object
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#### Definitions

force a push or pull on an object
gravity force of attraction between all masses
friction force that opposes motion
inertia an object at rest tends to stay at rest, an object in motion tends to stay in motion
unbalanced forces when opposite forces on an object are not equal, resulting in motion
balanced forces when opposite forces on an object are equal, resulting in no motion
acceleration change in speed
speed the rate of motion, calculated by distance over time
momentum it is harder to stop a train than a car because the greater the mass, the more the _______________
velocity speed in a given direction
reaction for every action there is an opposite and equal ______________
weight a measure of the force of gravity on an object
mass the amount of matter in an object
Newton scientist who created three laws of motion
Physics the study of the interactionof matter and energy
motion process of changing position or place
kinetic energy of motion
potential energy that is stored/no motion
simple machine a tool that makes work easier
wheel and axle machine made up of a wheel and rod that goes through the wheel
lever a board or bar that rests on a turning point
pulley machine made up of a wheel and rope
fulcrum the turning point of a lever, place that pivots
wedge machine used to push two objects apart, made up of two inclined planes
screw a special inclined plane that winds around
inclined plane a flat surface that is higher on one end
distance-speed _________ divided by time
centripetal force force that causes an object to move in a circular motion
load an object that a lever moves
matter anything that has mass and takes up space

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