Why is the work output of a machine never equal to the work output?

Why is the work output of a machine never equal to the work output?

Work output can never be greater than work input. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work. When a machine changes the size of the force, the distance through which the force is exerted must also change.

Why is the efficiency of a machine always less than 100 percent Why?

The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction, the efficiency of any machine is always less than 100 percent.

How can you make the work output of a machine greater than the work input?

The only way to increase the work output is to increase the work input. You can’t get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.

Why is the efficiency of a machine less than 1?

Why is the efficiency of machine always less than one? Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of a machine can never be greater than its input, so the efficiency can never be greater than 1.

What prevents the output work from never being greater than the input work in an ideal machine?

some machines change only the direction of the force, not the size of the force or the distance through which the force is exerted. The work output of a machine can never be greater than the work input. In fact, the work output of a machine is always less than the work input due to friction.

Why can a machine never have an efficiency of 100 quizlet?

Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input.

Can a machine have an efficiency that is greater than 100 explain?

Explanation: No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). That is why 100% efficiency in machines shall not be possible.

What machine actually reduces the amount of force exerted because it acts over a greater distance?

What machine actually reduces the amount of force exerted because it acts over a greater distance? a garden rake. A wrench reduces the force needed to tighten a bolt.

What is a mechanical advantage less than 1?

If the mechanical advantage is less than 1, then we will have to apply more force to get the same amount of force output. One can think of this situation as analogous to spending more money but getting a product worth less. In other words, force applied is more than force produced.

Why is the mechanical efficiency of most compound machines lower than most simple machines?

Because compound machines have more moving parts than simple machines, they generally have more friction to overcome. As a result, compound machines tend to have lower efficiency than simple machines. This is how friction is reduced in a car engine.

Why can work output be less than work input but never be more?

The output work is always less than the input work because some of the input work is used to overcome friction. You can never get more work out of a machine than you put into it. In fact, a machine always does less work on an object than the user does on the machine.

Why is it impossible to get an efficiency of 100% or greater?

It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.