Question

All of you must have enjoyed sitting on a giant wheel. What makes the giant wheel go round? 

The giant wheel is fitted to a rod at its centre. This rod is called an ‘axle’. When the axle starts rotating with the help of electricity, the wheel fitted to it also starts rotating. This combination of an axle and a wheel is a simple machine. We see innumerable examples of its use. 

Answer 1

The giant wheel goes round because it is fixed to a rod at its centre called an axle. When electricity makes the axle rotate, the wheel attached to it also rotates. Thus, the wheel and axle work together as a simple machine to make the giant wheel go round.