Content Vocabulary for Forces & Motion
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acceleration: a change in speed or direction of an object
balanced forces: forces that are equal in size but opposite in direction
complex or compound machine: a machine made of two or more simple machines
energy: the ability to do work
force: the amount of push or pull on an object
friction: force that makes an object slow down or stop
fulcrum: the pivot point for a lever
gravity: force that pulls an object towards the center of the earth
inclined plane: any slanted surface
inertia: force that keeps a still object still or keeps a moving object moving
lever: simple machine that made of a stiff bar that rests on a support
load: how heavy the amount of work is
kinetic energy: energy being used at a particular time
magnetism: the force of pushing or pulling between magnet poles
momentum: the measure of how hard it is to slow down or stop an object
motion: is what happens when an object changes its’ position
net force: two or more forces acting together on an object
position: the place of an object
potential energy: stored up energy that isn’t being used yet
power: amount of work done during specific amount of time
pulley: a simple machine that uses a wheel and a rope to raise and lower an object
screw: an inclined plane that is wrapped around a pole
speed: the measure of how fast an object moves
unbalanced forces: when one force is greater than the other force, causing the weaker one
to move
velocity: the speed of an object
wedge: simple machine that has a slanted side and ends in a sharp edge
wheel and axle: simple machine made of a wheel with a rod through the center to move the
load
work: the use of force to move an object