When a machine is running at 100 % efficiency there is no loss of energy anywhere. That means the machine is running silently and if turned off will continue to run without stopping. In the real...
Friction, force that opposes the motion of an object when the object is in contact with another object or surface. Friction results from two surfaces rubbing against each other or moving relative to...
Friction makes machine work slower which take a longer time to perform a task. so if there is too much friction in the machine then the machine won't be good.