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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.
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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
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.
What fields of science study machines?
Fields of science that study machines include robotics, mechanical engineering, computer science, and artificial intelligence. These disciplines investigate the design, development, and functioning of machines to improve their efficiency, intelligence, and capabilities.
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.
How do you improve efficiency in simple machine?
To improve efficiency in simple machines, you can reduce friction by using lubricants, ensure components are properly aligned, and minimize energy losses by selecting appropriate materials. Regular maintenance and overall design optimization can also help improve efficiency.
How is a machines mechanical efficiency is calulated?
Mechanical efficiency of a machine is calculated by dividing the actual output of work by the theoretical output of work, and then multiplying by 100 to express it as a percentage. It is expressed as: efficiency = (Actual output / Theoretical output) * 100%. A higher mechanical efficiency indicates that the machine is operating more effectively with less energy loss.
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.
