click below
click below
Normal Size Small Size show me how
chapter 3
work and power
Term | Definition |
---|---|
work | the transfer of energy to an object by a force that makes an object move in the direction of the force. is only being done while the force is applied tto an object |
power | the rate at which work is done |
mechanical advantage | the ratio of a machine's output force produced to the input force applied |
efficiency | the ratio of the output work to the input work |
simple machines | do work using only one movement |
lever | a simple machine made up of a bar that pivots, or rotates, about a fixed point |
fulcrum | the point about which a lever pivots |
wheel and axle | an axle attached to the center of a wheel and both rotate together |
inclined plane | flat, sloped surface |
wedge | a sloped surface that moves |
screw | an inclined plane wrapped around a cylinder |
pulley | a simple machine that is a grooved wheel with a rope or a cable wrapped around it |