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# Forces and Motion

TermDefinition
Motion Displacement of an object over a period of time
Speed A measure of how fast something is moving
Force A push or pull exerted on an object in order to change the motion of the object
Net Force The combination of all of the forces acting on an object
Newton the SI unit for force (symbol N)
Friction A force that opposes the motion of an object
Gravity The force of attraction between all matter
Mass The measure of the amount of matter in a body
Weight A measure of the gravitational force exerted on an object
Force A push or pull
Velocity The speed of an object in a particular motion
Acceleration The rate at which velocity changes over time
Inertia Property of matter that makes matter resist a change in motion
Kinetic Energy Energy associated with moving bodies
Potential Energy Stored energy that can be released
Mechanical Energy The energy that is possessed by an object due to its motion or due to its position
Energy Conservation Reducing energy consumption through using less of an energy service
Work The product of a force and the distance through which it acts
Electrical Circuit A closed loop through which charges can continuously move
Energy The ability to do work
Inclined Plane A simple machine that is a straight, slanted surface which facilitates the raising of loads
Pulley A simple machine that consists of a wheel over which a rope, chain or wire passes
Lever A simple machine that consists of a bar that pivots at a fixed point called a fulcrum
Wheel and Axel A simple machine consisting of two circular objects of different sizes
Wedge a simple machine that is made up of two inclined planes that move
Screw A simple machine that consists of an inclined plane wrapped around a cylinder
Mechanical Advantage A number that tells how many times a machine multiplies force
Mechanical Efficiency A quantity, usually expressed as a percentage, that measures the ratio of work output to work input
Created by: Wattsr