When M.A = Effort of arm/Load arm Also V.R = Effort of arm/Load arm

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1

When M.A = Effort of arm/Load arm
Also V.R = Effort of arm/Load arm
Then new can M.A be less than V.R for practical machines

2
  • Mechanical advantage reduces gradually due to the weight and friction of the moving parts of a machine.
  • Whereas, the velocity ratio of a machine always remains constant.
  • This is the reason why mechanical advantage in a practical machine is always less that velocity ratio.
  • Another reason is that the efficiency of a machine is given by the ratio of mechanical advantage to velocity ratio.
  • Thus, if mechanical advantage is equal to velocity ratio, it will mean that the machine is 100% efficient which is practically impossible.