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5th: Forces/Motion

5th grade vocabulary for forces and motion.

QuestionAnswer
acceleration change in velocity with respect to time
action The force one object applies to another. Newton's 3rd Law: For every action, there is an equal but opposite reaction.
balanced forces When two forces cancel each other out.
force A push or a pull.
friction A force that opposes the motion of one object moving past another.
gravity The force of attraction between any two objects due to their mass.
inclined plane A slanted surface used to move objects higher or lower.
inertia The tendency of a moving object to keep moving in a straight line or of any object to resist a change in motion.
lever A simple machine made of a rigid bar and a fixed pivot point, called the fulcrum.
mass A measure of the amount of matter in an object.
pulley A wheel and rope that changes the direction of force.
reaction The force with which an object responds to an action, as in Newton’s third law of motion.
simple machine A machine with few moving parts, making it easier to do work.
speed How fast an object’s position changes with time at any given moment.
unbalanced forces Forces that do not cancel each other out when acting together on a single object.
velocity The speed and direction of a moving object.
weight The force of gravity between Earth and an object.
wheel and axle A wheel with a rod through the middle.
Created by: jmitchell84 on 2010-11-11



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