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Willard Science 13
Chapter 13 Key Terms
Question | Answer |
---|---|
Work | The transfer of energy to an object by the application of a force that causes the object to move in the direction of the force. |
Power | A quantity that measures the rate at which work is done or energy is transformed. |
Mechanical advantage | A quantity that expresses how much a machine multiplies force or distance. |
Simple Machine | One of the six basic types of machines, which are the basis for all other forms of machines. |
Compound machine | A machine made of more that one simple machine. |
Energy | The capacity to do work |
Potential energy | The energy that an object has because of the position, shape, or condition of the object. |
Kinetic energy | The energy of an object due to the object's motion. |
Mechanical energy | The amount of work an object can do because of the object's kinetic and potential energies. |
Efficiency | A quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input. |