Simple Machines. Simple machines: Reduce the effort (force multiplier)

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Presentation transcript:

Simple Machines

Simple machines: Reduce the effort (force multiplier)

Simple machines: Reduce the effort (force multiplier) Change point of application of effort to a convenient point

Simple machines: Reduce the effort (force multiplier) Change point of application of effort to a convenient point Change the direction of effort

Simple machines: Reduce the effort (force multiplier) Change point of application of effort to a convenient point Change the direction of effort Produce a gain in speed

Simple machines: Reduce the effort (force multiplier) Change point of application of effort to a convenient point Change the direction of effort Produce a gain in speed

Load Effort Mechanical advantage, M.A. = Load (L) Effort (E) L > E - M.A. > 1 – force multiplier E > L - M.A. < 1 – gain in speed E = L - M.A. = 1 – changes direction of effort (no change in force/speed) Units Technical terms

Velocity ratio, V.R. = Velocity of effort (V E ) Velocity of load (V L ) V.R. = d E /t d L /t V.R. = d E d L d E > d L – V.R. > 1 – force multiplier d L > d E – V.R. < 1 – gain in speed d L = d E – V.R. = 1 – changes direction of effort (no change in force/speed) Units Technical terms

Work input Work output MachineEffort Load Work input Work output

Technical terms Work input Work output MachineEffort Load Work input Work output

Technical terms Work input Work output MachineEffort Load Work input Work output

Technical terms Work input Work output MachineEffort Load Work input Work output Efficiency, η =

Technical terms Work input Work output MachineEffort Load Work input Work output Efficiency, η = Units

Technical terms Effort point Load point Input energy Output energy Principle of a machine Relation between M.A., V.R. and η

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