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PHYSICS

asp 4-B MECHANICAL ENERGY

WORDS TO KNOWDEFINITIONS
Conservation of energy The principle that the amount of energy iin any system remains the same, even if the form of the energy changes
Conservation of matter The principle that the amount of matter in any system remains the same, even though it may have gone through physical or chemical change
Elastic potential energy Potential energy that is created by tension in an object such as a stretch rubber band
Energy The ability to do work
Gravitational potential energy Potential energy due to an object's position relative to Earth or some other gravitational field
Joule (J) The unit of energy or work
Kinetic energy Energy of a body in motion; (1/2mv2)
Mechanical advantage The ratio of output force to input force for a simple machine (resistance force/effort force or effort distance/resistance distance)
Potential energy Stored energy because of its position or tension (mgh)
Simple machine Any of the devices that work with one movement; includes the lever, wheel and axle, pulley, inclined plane, wedge, and screw
Work The transfer of energy, measured as the product of the force applied to an object and the distance moved by that object in the direction of the force applied; equal to force x distance (f x d)
Power The rate at which work is done (W/t)
Efficiency The amount of work output divided by the work input expressed as a percentage
Effort distance The distance an input force moves in a simple machine
Resistance distance The distance the output force moves the resistance
Watt (or kilowatt) The unit for power
Created by: MEL3024
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