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Motion and Forces

Unit 2, Lesson 1-3

Work The transfer of energy to an object by using a force that causes the object to move in the direction of the force.
Energy The ability to cause change.
Power The rate at which work is done or energy is transformed.
Kinetic Energy The energy of an object that is due to the objects motion.
Potential Energy The energy that an object has because of the position, condition, or chemical composition of the object.
Mechanical Energy The sum of an objects's kinetic energy and potential energy due to gravity or elastic deformation; does not include chemical energy or nuclear energy.
Machine A device that helps do work by changing the magnitude and/or direction of an applied force.
Fulcrum The point on which a lever pivots.
Mechanical Advantage Number that tells how many times a machine multiplies input force.
Wheel and Axle A simple machine consisting of two circular objects of different sizes.
Mechanical Efficiency A quantity, usually expressed as a percentage, that measures the ratio of work output to work input in a machine.
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.
Inclined Plane A simple machine that is a straight, slanted surface, which facilities the raising of loads; a ramp.