Question

not all the energy put into a machine to do work.give reason​

Answer 1

Explanation:

All machines are subject to energy conservation in that no machine can output more energy (do more work) than the energy put into it. Workout is less than or equal to Workin, or Energyout is less than or equal to Energyin. In other words, no machine can be more than 100% efficient

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Answer 2

Explanation:

Well kids, when dinosaurs ruled the Earth, prehistoric plants were busy converting light energy from sunlight into chemical potential energy (via photosynthesis) which was stored in the plants' cells. When the plants died and were buried in sediment, they carried this potential energy with them. Time and pressure turned these prehistoric plants (and the animals that ate them) into coal. When we burn the coal, the energy we get is the energy from the Sun stored by these prehistoric plants.

At the very best, the amount of work done on an automobile by its engine would equal the amount of energy in the gasoline used - but this would never happen in practice. In practice, a lot of the energy in the gasoline is lost as heat which simply heats the engine, or is lost out the tailpipe, Also, friction forces in the engine and the automobile takes a good deal of the energy, and a lot of the energy from the gasoline is used for other purposes, such as to cool the engine to keep it from melting! In practice, an "efficient" car powered by a gasoline engine will use about 30% of the available energy for useful work.

A machine can alter an input force by changing its (1) magnitude, or (2) direction.

All machines are subject to energy conservation in that no machine can output more energy (do more work) than the energy put into it. Workout is less than or equal to Workin, or Energyout is less than or equal to Energyin. In other words, no machine can be more than 100% efficient. Machines cannot multiply energy or work input.

To say that a machine has a certain mechanical advantage tells you how much the machine multiplies input force. In other words, if a machine has a mechanical advantage of 3, the machine will exert a force of 15 N if you exert a force of 5 N.

The output force is smaller than the input force for a Type 3 lever - the one that has the force between the fulcrum and the load. What good could this possibly be? Well, most of your bones and muscles are "wired up" as Type 3 levers. Why is this?

Efficiency = (workout)/(workin)(100%) = (35 J)/(100J)(100%) = 35%

Theoretical mechanical advantage does not account for friction, actual mechanical advantage does. If a machine were 100% efficient then it can't have any energy losses to friction, so no friction can be present. In that case the theoretical and actual mechanical advantages would be equal.

Efficiency = (workout)/(workin)(100%) = (100 J)/(1000 J)(100%) = 10%