Question

notches are carved on the tyres of vehicle because-

1. To make the tyres look beautiful
2. To increase friction
3. To decrease friction
4. To raise the speed

Answer 1

2. To increase friction

Answer 2

Notches are carved on the tyres of vehicles because To Increase the Friction.

Reason :

Friction is a necessary evil in our daily life.
When vehicles run on the road, there is a friction between the surface of road and tyre of the vehicle.
When road is wet, there is a layer of water which acts as lubricants and reduces friction which results in vehicle loosing the grip.
Hence to provide a better grip on slippery and wet road , the tyres are provided with treads or notches.