THE WHEEL- MECHANICAL BATTERY

Wheel is an important invention and it is one of the 6 simple machines. It is heavily used in transportation since it greatly reduces friction. We have ship's wheel, steering wheel, potter's wheel, gyroscope and fly wheel.

When you ride a motorbike and switch off the engine abruptly, it continue to run for a long distance on a smooth road because of the special design of the wheel. Here, the wheel is large and number of spokes are connected to the heavy rim from the axle. The rim carries heavy mass since air filled Tyre is mounted on it. This is called fly wheel design. In this design, the moment of inertia is high or rotational mass is heavy. So it carries a lot of energy and stopping it will be difficult. So the fly wheel seems to have a storage of mechanical energy.

The man made forces cannot disturb the earth's rotations even slightly because it is so heavy and carries enormous energy.

The fly wheel is also used between the engine and the wheels of a vehicle for smooth transfer of rotational energy.

Advanced note:
Moment of inertia or rotational mass = mass *( distance of the mass from the axis)^2.
Hence,to increase rotational mass of a wheel, the mass is distributed away from the axle on the rim. When rotational mass is increased, the wheel is able to carry lot of energy.

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