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# S8P3.a-c

### Science terms

TermDefinition
force a push or pull exerted on an object in order to change the motion of the object; force has size and direction
motion an objectÅ› change in position relative to a reference point
reference point a stationary object that is used to describe an objectÅ› motion
speed the distance traveled divided by the interval during which the motion occured
speed the distance traveled divided by the time interval during which the motion occurred
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
friction a force that oppose motion between two surfaces that are in contact
net force the combination of all the forces acting on an object
balanced force stated when the net forces acting on an object equals zero
unbalanced force stated when the net force acting on an object is not zero
inertia the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object
gravity a force of attraction between objects that is due to their masses
work the transfer of energy to an object by using a force that causes the object to move in the direction of the force
machine a device that helps do work either by overcoming a force or changing the direction of the applied force
inclined plane a simple machine that is a straight, slanted surface, which facilitates the raising loads; a ramp
wedge a simple machine that is made up of to incline planes and that moves, often used for cutting
screw a simple machine that consists of an inclined plane wrapped around a cylinder
lever a simple machine that consists of a bar that pivots at a fixed point called a fulcrum
pulley a simple machine that consists of a wheel over which a rope, chair, or wire passes
wheel and axle a simple machine consisting of two circular objects of different sizes; the wheel is the large of the two circular objects
Created by: heey.its.mya