| A | B |
|---|
| machine | device that makes work easier |
| simple machine | device that does work with only one movement |
| effort force | force applied to the machine |
| resistance force | force applied by the machine |
| ideal machine | a machine in which work input equals work output; such a "perfect" machine would be frictionless and 100% efficient |
| mchanical advantages | the number fo times a machine multiples the effort force applied to it |
| lever | a bar that is free to pivot, or turn, about a fixed point |
| fulcrum | the fixed point of a lever |
| effort arm | the part of a lever on which the effort force is applied |
| resistance arm | the part of the lever that exerts the resistance force |
| pulley | a grooved wheel with a rope or a chain running along the groove |
| wheel and axle | a simple macine consisting of two wheels fo different sizes that rotate together |
| inclined plane | a sloping suface usedraise object |
| screw | an inclined planewrapped around a spiral around a cylindrical post |
| wedge | inclined plane with one or two sloping sides |
| bionics | the science of designing artifical replacements for parts of the human body |
| compound machine | a combination of two or more simple machines |
| efficiency | measure of how much of the work put into a machine is changed to useful work put out by a machine |
| power | the rate at which work is done |
