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PHYSICS
asp 4-B MECHANICAL ENERGY
WORDS TO KNOW | DEFINITIONS |
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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 |