Machines
Velocity Ratio: This is the ratio of the distance moved by the effort to the distance moved by the load in the same interval of time. Thus,
Velocity Ratio = 
Input : The work done by the effort is known as input.
Input = PD
Output: It is defined as useful work got out of the machine, i.e. the work done by the load.
Output = Wd
Efficiency : This is defined as the ratio of output to the input.
Efficiency of an ideal machine is 1. In that case, Wd =PD, which gives W/P= D/d. Thus, for an ideal machine, mechanical adavntage is equal to velocity ratio.
Machines
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Velocity Ratio: This is the ratio of the distance moved by the effort to the distance moved by the load in the same interval of time. Thus, Velocity Ratio = |