Question

Why are wheels of an automobile made circular?

Answer 1

Hint:The friction between two surfaces transforms kinetic energy into thermal energy as they move relative to each other (that is, it converts work to heat). The utilisation of friction generated by rubbing pieces of wood together to ignite a fire is an example of how this feature may have severe effects.

Complete answer:
When motion with friction occurs, such as when a viscous fluid is churned, kinetic energy is transformed to thermal energy. Wear is another major consequence of various forms of friction, which can result in performance deterioration or component damage. The science of tribology includes friction as a component.

The objective of making the wheels of cars or autos round is to reduce the frictional force.Because rolling friction is lower than sliding friction, wheels are designed to be round. If the wheels had been of a different form, sliding friction would have been involved, resulting in additional friction and difficulty in the movement of cars and autos.

The force that opposes or slows the motion of a wheel or a ball rolling on the ground (the curved surface). It is considered that when one body is claimed to be rolling on another body or surface, there is no slippage or sliding. The fact that rolling friction is a weak force explains why pulling an almirah with wheels is simpler. When compared to static, kinetic, or limiting friction, the amount of rolling friction is small. Between the point of contact between the curved surface and the ground, rolling friction is typically a mixture of multiple forms of friction.

Note:Due to rolling resistance, including that of the bearings, any coasting wheeled vehicle will progressively slow down, but a railway car with steel wheels on steel rails will roll farther than a bus of the same mass with rubber tyres on pavement. The (amount of) deformation of the wheels, the deformation of the roadbed surface, and movement beneath the surface all contribute to rolling resistance. Wheel diameter, load on wheel, surface adhesion, sliding, and relative micro-sliding between the surfaces of contact are all significant variables. Hysteresis losses are also greatly influenced by the wheel or tire's material characteristics as well as the surface.