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# S8P3.a, b, c

### S8P3.a

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 object's change in position relative to a reference point.
reference point a stationary object that is used to describe an object's motion.
speed the distance traveled divided by 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 equal zero.
unbalanced force stated when the net force acting on an object is not zero.
interia 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 of loads; a ramp.
wedge a simple machine that is made up of two inclined 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: J.Eliz

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