| A | B |
|---|
| work | force acting upon an object in the direction the object moves |
| joule | the metric unit that measures work or energy:abbreviated is J |
| power | the rate at which work is done, measured in watts |
| watt | the basic SI unit of power; one watt equals one joule per second. Abbreviated:W |
| machine | a device that makes work easier by changing the direction or distance an object moves, or by reducing the amount of force needed to do work |
| mechanical advantage | the advantage gained by using a machine to transmit force. Abbreviated:M.A. |
| mechanical efficiency | the measurement that compares a machine's work output with its work input |
| simple machine | a machine that does work in one movement |
| compound machine | a system of two or more simple machines |
| formula for work | force x distance |
| formula for power | work/time |
| formula for mechanical advantage | resistance force/effort force |
| formula for mechanical efficiency | workouput/work input x 100% |
