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There is a machine in which the velocity ratio is 4 and mechanical advantage is nearly 4. If the friction in the machine increases

एक मशीन है जिसमें वेग अनुपात 4 है और यांत्रिक लाभ लगभग 4 है। यदि मशीन में घर्षण बढ़ जाता है

A.

The mechanical advantage and velocity ratio will remain same

B.

Velocity ratio will decrease 

C.

Mechanical advantage will increase

D.

Solutions 
Mechanical advantage will decrease

Velocity Ratio(VR):

• 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  = D / d

Mechanical advantage(M. A.):

• This is the ratio of load lifted to effort applied. Thus,if W is the load and P is the corresponding effort, then
• Mechanical Advantage  = W / P

There is no change in velocity ratio or mechanical advantage of a simple machines with the change in friction.