Chapter 14 - Work, Power and Machines

machine made up of a combination of two or more simple machines

• compound machine

• simple machine

• mechanical advantage

• power

equals the output work divided by the input work; expressed as a percentage

• input force

• efficiency

• output force

• mechanical advantage

simple machine that is a flat surface, sloped surface, or ramp

• lever

• screw

• inclined plane

• wedge

the force exerted on a machine

• output force

• mechanical advantage

• power

• input force

simple machine consisting of a rigid rod or plank that pivots or rotates about a fixed point called the fulcrum

• lever

• inclined plane

• screw

• wedge

number of times the input force is multiplied by a machine; equal to the output force divided by the input force

• efficiency

• mechanical advantage

• work

• power

the force exerted by a machine

• input force

• mechanical advantage

• output force

• efficiency

rate at which work is done; equal to the work done divided by the time it takes to do the work; measured in watts

• work

• compound machine

• simple machine

• Power

simple machine made from a grooved wheel with a rope or cable wrapped around the groove

• Pulley

• wheel and axle

• lever

• screw

A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral

• inclined plane

• screw

• wedge

• lever