click below
click below
Normal Size Small Size show me how
Ps ch5
Vocab
Term | Definition |
---|---|
work | is the transfer of energy that occurs when a force makes an object move |
power | is the amount of work done in one second |
machine | is a device that makes doing work easier |
input force | force that is applied to the machine |
output force | force that is applied by the machine |
mechanical advantage | ratio of the output force to the input force |
efficiency | a measure of how much of the work put into a machine is changed into useful output work by the machine |
simple machine | machine that does work with only one movement of the machine |
lever | a bar that is free to pivot or turn around a fixed point |
pulley | a grooved wheel with a rope, chain, or cable running along the groove |
wheel and axle | simple machine consisting of a shaft or axle attached tot he center of a larger wheel, so that the wheel and axle rotate together |
inclined plane | a sloping surface, such as a ramp that reduces the amount of force required to do work |
screw | an inclined plane wrapped in a spiral around a cylindrical post |
wedge | an inclined plane with one or two sloping sides |
compound machine | two or more simple machines that operate together |