In Actual Machines

Answer: 3– Mechanical advantage is lesser than velocity ratio.

In actual machines, Mechanical advantage is lesser than velocity ratio.

Solution:

Mechanical advantage: When effort (P) balances a load (W) in simple machines, the ratio is called Mechanical advantage (MA).

M.A. = Load/Effort = W/P

Velocity Ratio(VR): Ratio between the distance moved by the effort to the distance moved by the load.

VR = distance moved by the effort(dp)/ distance moved by the load(dw)

Efficiency: In a simple mechanism, it is defined as the ratio of mechanical advantage to the velocity ratio.

η= M.A.V.R.

An ideal machine’s efficiency is 100% or unity, so the mechanical advantage equals the velocity ratio.

In the actual machine, efficiency is less than 1

η<1 ⇒ M.A./V.R. < 1 ⇒ M.A. < V.R.

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