Chapter No. 01 Simple Machines

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Presentation transcript:

Chapter No. 01 Simple Machines Calculate Mechanical advantage, Velocity ratio and efficiency of various simple Machines.

Basic Concepts Load (W) Effort (P) Mechanical Advantage (M.A.) = = Velocity Ratio (V.R.) = Efficiency = x 100

Losses (Effort and Load) Ideal Effort (Pi) = Effort lost in friction (Pf) = P-Pi Ideal Load (Wi) = PxV.R. Load lost in friction (Wf ) = Wi - W

Law of Machine P = mW + C P = Effort required to lift load Effort (P) P = mW+C Equation Of straight Line P = mW + C P = Effort required to lift load m = slope of line W = Load lifted by the machine C = Effort required to start the Machine ᶿ C Load (W)

Simple axle and Wheel Velocity Ratio =

Differential Axle and Wheel Velocity Ratio =

Single Purchase Crab Winch Velocity Ratio =

Double Purchase Crab Winch Velocity Ratio =

Worm and Worm-Wheel Velocity Ratio =

Simple Screw Jack P Velocity Ratio =

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