Short-Question

# Is practical machine and actual machine same?

## Is practical machine and actual machine same?

Yes. Both the actual machine and practical machine are same.In these machines the output is always less than its input. They have efficiency less than 100%.

### What is the relation between Ma and VR in practical machine?

For an ideal machine, M.A. = V.R. (ii) In the case of a practical machine, the mechanical advantage is always less than its velocity ratio or the output work is always less than the input work as some of the input energy is lost due to the force of friction etc.

#### What is the efficiency of a practical machine?

Answer: The efficiency of a actual machine is equal to the ratio of its output ( resistance multiplied by the distance it is moved ) to it’s input ( effort multiplied by the distance through which it is exerted ); it is also equal to the ratio of the AMA to the IMA.

What is meant by ideal machine?

The term ideal machine refers to a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies. Mechanical efficiency is the performance of the machine compared to its theoretical maximum as performed by an ideal machine.

Is AMA less than IMA?

The mechanical advantage (MA) of a machine is the factor by which it multiplies any applied force. In any real machine some of the effort is used to overcome friction. Thus, the ratio of the resistance force to the effort, called the actual mechanical advantage (AMA), is less than the IMA.

## Why Cannot a practical machine have 100% efficiency?

A machine cannot be 100 percent efficient because output of a machine is always less than input. A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.

### Which relationship is true for practical machines?

All practical machines have friction and hence the output energy ia always less than the input energy. Therfore the efficiency of all practical machines is always less than 1.

#### Why is a machine not 100% efficient?

What is IMA and AMA?

The AMA of a simple machine is the ratio of output to input forces. The IMA is the ratio of input distance to output distance.

Is AMA equal to IMA?

Explanation: The Actual Mechanical Advantage AMA is equal to: The ideal mechanical advantage, IMA, is the same but in absence of FRICTION! In this case you can use the concept known as CONSERVATION of ENERGY.