Question

Why will a lubricant affect the efficiency of a simple machine such as a pulley? ​

Answer 1

Answer:

It will increase the efficiency of pulley because it reduces the fictional effect

Answer 2

Answer:

How will a lubricant affect the efficiency of a simple machine such as a pulley?

A pulley has a center axle around which it rotates. A rope passes over the pulley and is attached to the load. In an ideal pulley the work done in lifting the load is exactly the same as the energy expended. In a real pulley, because of the friction, we need to spend more energy in lifting the load. The additional energy is dissipated, i.e., wasted in the friction. Adding a lubricant to the shaft of the pulley reduces the friction and therefore increases the efficiency. A very thin layer of oil (lubricant) in between the moving and stationary parts can reduce friction very significantly

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