Work and Energy

Work

Transfer of energy when a force is applied over a distance; measure in joule

Machine

Device that makes doing work easier by increasing the force applied to an object, changing the direction of an applied force or increasing the over which a force can be applied

Simple machine

Machine that does work with only one movement; examples include lever, pulley, wheel and axle, included plane screw and wedge.

Efficiency

Ratio of the output work done by the machine to the input work done on the machine expressed as a percentage

Mechanical Advantage

Ratio of the output force exerted by a machine to the input force applied to the machine

Energy

The Ability to cause change measured in joules

System

A regional or set of regions around which a boundary can be defined

Kinetic Energy

Energy a moving object has become of it motion determined by the mass and speed of the object

Potential Energy

Energy that is stored due to the interactions between objects

Elastic Potential Energy

Energy that is stored by compressing or stretching an object

Chemical Potential Energy

Energy that is due to chemical bonds

Gravitational Potential Energy

Energy that is due to the gravitational force between objects

Law of Conservation of energy mechanical energy power

States that energy cannot be created or destroyed