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WORK POWER AND ENERGY
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SIMPLE MACHINE
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OBJECTIVES, • Define simple machine, • Explain mechanical advantage and, velocity ratio, • Explain efficiency of machine, • Drive relationship between efficiency,V.R, and M.A
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DEFINITION, , A machine is a thing that is created, by people to make work easier.
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EXAMPLES OF SIMPLE MACHINE
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MECHANICAL ADVANTAGE (M.A), The ratio of load lifted to effort applied., M.A = Load/ Effort, • The 1st force applied to the, machine is known as effort, • Where as force overcome by, an effort is known as load
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VELOCITY RATIO(V.R), The ratio of distance moved by effort to the, distance moved by load is termed as velocity, ratio., Velocity Ratio = distance moved by effort, distance moved by load
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EFFICIENCY OF MACHINE, The ratio of output to the input of, machine., OR, The ratio mechanical advantage to the, velocity ratio, Efficiency is generally expressed in, percentage(%)., Efficiency = Output/Input.
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OUT PUT AND INPUT, • Output is a product of load and, distance moved by load., • Input is a product of effort and, distance moved by effort
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RELATIONSHIP BETWEEN EFFICIENCY,V.R AND M.A, Efficiency = Output/Input, = Load x distance moved by load, Effort x distance moved by effort, = Load x, distance moved by load, Effort, distance moved by effort, = M.A X 1, V.R, = M.A / V.R
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SUMMARY, ➢Simple machine, ➢Mechanical Advantage And Velocity, Ratio, ➢Efficiency, ➢Relation of M.A , V.R and Efficiency
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PROBLEMS ON SIMPLE MACHINE
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THANK YOU