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Unit 2 Energy
Science
Term | Definition |
---|---|
Work | The transfer of energy to an object by using a force that causes the object to movie 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 object;s 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 object's kinetic energy and potential energy due to gravity or elastic deformation; doe 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. |
Mechanical advantage | A number that tells how many times a machine multiplies input force. |
Mechanical efficiancy | A quantity, usually expressed as a percentage, that measures the ration 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. |
Wheel and axle | A simple machine consisting of two circular objects of different sized; the wheel is the larger of the two circular objects, and the axle is attached to the center of the wheel. |
Pulley | A simple machine that consists of a wheel over which a rope, chain, or wire passes. |
Inclined plane | A simple machine that is a straight, slanted surface, which facilitates the raising of loads; a ramp. |