# How Do You Define A Machine In Physics?

## 7 Answers

Sudipa Sarkar answered
A machine is a device by which a small force applied at convenient point can be used to overcome a large force at some other point. Although the force overcome by a machine is many times greater than the input force, the energy or work output can never be greater than the input energy or work. In principle                Work input=Work output    In a machine, some energy is always wasted in overcoming frictional forces. In practice, therefore, the useful work done by a machine is always less the input work. The ratio of the useful work done by a machine and input work is called the efficiency of the machine. Usually, the ratio is expressed as a percentage, i.e.    Efficiency=Useful work done by the machine/Work done on the machine*100%    Thus in practice the efficiency of a machine is always less than 100 per cent.
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Anonymous answered
A machine is a device that allow a force applied at one point to be overcome by a resisting force at another point.
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Anonymous answered
A machine is device in which a small application of force at one end can be used to overcome a greater effort at the other end.
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Anonymous answered
A machine is adevice that overcome with a large resistive force by applying small force in convenient direction at conveniont point
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Anonymous answered
Different of  work done by a machine to work by a machine
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Anonymous answered
Machine is a device which makes our work easy and in our surrounding many of things are machine,that is from pen nibs to bra zips are machine,pumping of boobs is done by machine so machine is very essential parts of our daily life thus use machine and perform safe sex.
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John answered
A machine takes the place of a human being ...doing. WORK-energy expended to perform a action to get a desired outcome.
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