The physics principle behind spin bowling in cricket is based on?

Answer 1

Spin Bowling is a rather simple idea compared to say swing bowling. Two basic physics concepts allow spin bowling to happen: inertia and friction.

The basic plan is that the bowler releases the ball such that it spins laterally in a certain direction (toward either the leg or off side: bowler's choice). When the ball actually hits the ground, the inertia of the ball combined with the friction of the pitch turns the spin into a momentary roll. The ball thus converts some of its spin into kinetic energy to move the ball in the direction of the spin. So when it comes back up off the ground upon completion of the bounce, it's actually moving in a different direction.

You can demonstrate this phenomenon for yourself with any simple ball capable of bouncing. Instead of simply dropping it onto a level floor, try dropping it while imparting a spin. When it hits the ground, you'll see the spin influence the direction the ball bounces. Spin bowling is simply a much-more-refined version of this technique.