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Forces and Motion

5th grade review of forces and motion units

TermDefinition/description
force any push or pull that causes an object to move, stop, or change directions
friction force that opposes, or acts against, motion when two surfaces rub against each other
magnetism the force of repulsion or attraction between poles of magnets
gravitation force that pulls all objects in the universe toward one another
balanced forces forces equal in size and opposite in direction
unbalanced forces when one force is greater than its opposite force
acceleration when an object starts to move, speeds up, slows down, stops, or changes direction
net force combined forces
work use of a force to move an object through a distance
power amount of work done for each unit of time
machine something that makes work seem easier by changing the size or direction of the force
position an object's place, or location
speed measure of the distance an object moves in a given amount of time
velocity an object's speed in a particular direction
acceleration any change in velocity
momentum measure of how hard it is to slow down or stop an object
inertia property of matter that keeps it moving in a straight line or keeps it at rest
Newton's first law of motion an object at rest will stay at rest, and an object in motion will continue moving in a straight line at a constant speed until an outside force acts on it
Newton's second law of motion an object's acceleration depends on the size and direction of the force acting on it and on the mass of the object
Newton's third law of motion For every action, there is an equal and opposite reaction
orbit the path one body in space takes as it revolves around another body
Created by: cwillingham
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