Energy

4. - the SI unit of work and of all other forms of energy; one joule (J) of work is done when a force of one newton (N) is exerted on an object moved one meter (m) in the direction of the force
7. energy - energy of position, usually related to the relative position of two things, such as a stone and the earth
9. - a simple machine, made of a bar that turns about a fixed point
10. - the ratio of useful energy output to total energy input, or the percentage of the work input that is converted to work output
13. advantage - the ratio of output force to input force for a machine
14. - that property of an object or a system which enables it to do work

1. - the product of the force on an object and the distance through which the object is moved
2. energy - the energy due to the position or the movement of something; potential or kinetic energy (or a combination of both)
3. - a type of lever that is a wheel with a groove in its rim, and one that is used to change the direction of a force
5. - the pivot point of a lever
6. - rate at which work is done or energy is transformed, equal to the work done or energy transformed divided by time
8. - a device for increasing (or decreasing) a force or simply changing the direction of a force
9. of conservation of energy - energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes
11. - the SI unit of power; one watt (W) is expended when one joule (J) of work is done in one second (s)
12. energy - energy of motion, equal to half the mass multiplied by the speed squared