GEN. SCIENCE - SIMPLE & COMPOUND MACHINES

efficiency

measure of how well a machine converts input energy or work into useful output without loss

work

product of force and distance an object moves in the direction of the force

mechanical advantage

ratio of output force to input force; dhows how much machine multiplies force

force

push/pull that can initiate stop or alter movement

simple machines

device with a few or no moving parts that changes the size or direction of a force

archimedes

contributed to the knowledge of simple machines in 3rd century BC

lever

rigid bars that pivots around a fixed point(fulcrum) to move or lift objects

fulcrum

fixed point

pulley

grooved wheel with rope or cable used to lift or move loads

wedge

inclined planes used together to direct force at a certain area

inclined planes

slanted surface used to raise or lower objects with less force

screw

inclined plane wrapped around a cylinder that converts rotational into linear motion

wheel and axle

wheel attached to a cylindrical rod

compound machines

device made up of 2 or more simple machines

compound machine; lever and wedge

simple machine; wheel & axle

simple machine; pulley

simple machine; wedge

simple machine: inclined plane

simple machine; screw

compound machine; lever and wedge

simple machine; screw

simple machine; wheel & axel