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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.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoIt reduces the amount of friction between the parts of the machine and keeps it cool, preventing it from over-heating and causing damage to the machine as well as allowing it to work faster and easier.
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Simple machines increase mechanical?
Simple machines increase mechanical advantage.
Why doesn't any system have 100 percent efficiency?
frictionIn real machines, as opposed to ideal machines, there is always friction that reduces the efficiency of the machine. Lubricants like oil can be used to reduce friction and improve efficiency.
What is a comparison of a machines work output and work input?
mechanical efficiency
What is a comparison of a machines work input and work output?
mechanical efficiency
How is a machines mechanical efficiency is calulated?
Work Output/Work Input X 100
Levers have a greater mechanical efficiency that other simple machines because?
They have to overcome less friction
Why is the mechanical efficiency of most compound machines lower than most simple machines?
It is lower because compound machines have more moving parts that a simple machine does.
Why do levers have a greater mechanical efficiency than simple machines?
The transmission lever is very simple and there is no friction.
How do ball bearings increase the efficiency of many machines?
they reduse the friction between the machine parts.
What is a a comparison of a machines work output with the works input that is mechanical?
Output power divided by input power, for a machine, is called the machine's efficiency. It need not be mechanical energy.
Is lubricants used on machines a period cost?
Product Cost.
Why does mechanical engineering include the word mechanical?
The word "mechanical" means "of, or pertaining to, machines" - and machines are what mechanical engineers concern themselves with.
