Question

The work done by a mation is lower
4. Efficiency
The valle of work dor He
is known as Cherney
Answer the following questions in short:
1. What is a machine? Why do we use machines?
2. How is a wheel a simple machine?​

Answer 1

Ans1 . A simple machine (or mechanical device) is a mechanical structure that uses power to apply forces and control movement to perform an intended action. ... They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems. Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever.

Ans2.The simple machine called a wheel and axle refers to the assembly formed by two disks, or cylinders, of different diameters mounted so they rotate together around the same axis. The thin rod which needs to be turned is called the axle and the wider object fixed to the axle, on which we apply force is called the wheel.

Hope this helps and I think wheels and axle both are useful when together.