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unit 2 energy

science

TermDefinition
Work The transfer of energy to an object by using a force that causes the object to move in the direction of the force.
Power The rate at which work is done or energy is transformed.
Energy The ability to cause change.
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 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.
Mechanic advantage A number that tells how many times a machine multiplies input force.
Mechanical efficiency A quantity,usually expressed as a percentage,that measures the ratio of work output to work input in a machine.
Lever A simple machine that consists of a bar that pivots at a fixed point called a fulcrum.
Fulcrum the point on which a lever pivots.
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