Question

Automobiles tires have generally irregular projections over their surfaces? Why?

Answer 1

Explanation:

The automobile tires have irregular protrusion over their surface due to the following reasons:

1. To increase the friction
2. Increase the grip on the ground and thus avoid their skidding.

Frictional force:

1. Whenever the surface of one item comes into contact with the surface of another, the force that opposes motion is called friction.
2. The mechanical advantage of a machine is reduced by friction, or in other words, the ratio of output to input is reduced because of friction.
3. An automobile uses one-quarter of its energy on limiting friction. Yet, it is also friction in the tires that allows the car to stay on the road and friction in the clutch that makes it possible to drive.
4. Automobile wheels are typically designed with an uneven protrusion on their surfaces to improve friction between the tires and indeed the ground. This improves the traction of the tires upon that roadway or path.
5. A car, for example, moves in a circular motion when turning.
6. As a result, the vehicle must be subjected to a force equivalent to the centrifugal force. The frictional force exerted on the vehicle provides this force.

Therefore, the uneven projections create friction between the tires and the road, preventing sliding.