Efficiency and Mechanical Advantage

machine efficiency

can be defined as the effectiveness of the simple machine, or the percentage of energy supplied (work input) that will actually be transferred to the object (work output)

mechanical advantage

• a measure of the force amplification achieved by using a tool, mechanical device or machine system

• ratio between the magnitude of the resisting force and the magnitude of the driving force

friction

creates resistance and converts useful energy to heat

material quality

smooth or lubricated surfaces reduce energy loss

mechanical design

proper alignment and lightweight parts increase efficiency

maintenance

clean, well-oiled machines run more efficiently