show the relationship among MA, VR and n
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The value of MA is always less than VR because:
Effort decreases due to friction. Load is equal to effort due to no friction. Load increases due to change in speed.
As velocity ratio or ideal mechanical advantage is a simple ratio of two distances, it also does not have the unit.
The friction is not involved in it.
The efficiency of a simple machine is defined as the ratio of useful work done by a machine (output work) to the total work put into the machine (input work).
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