| Run Length Mechanics: | | | | and also be slowed down in the air. A ball's recoil is |
| Mass of human * Velocity of stride = Mass of ball * | | | | dependant upon the initial velocity and the coefficient |
| Velocity of release --- (Law of conservation of | | | | of restitution. The release height of the ball is roughly |
| momentum)--(1) | | | | 1.8 - 2.2 meters. At 140 km/hr vertical speed with a |
| For a release velocity of 140 Km/ hr on the ball | | | | coefficient of restitution = 0.5 a ball would recoil up |
| Mass of ball = = 1.5 Kg | | | | to half of its height. But the speed observed (140 |
| Mass of human = 70 Kg | | | | Km/Hr) will not be released vertically. |
| Going by equation (1) | | | | For a release angle of 45 degrees with the vertical |
| 1.5 * 140 = 70 * V stride | | | | the vertical speed would be 140 * sin 45, the |
| V stride required of 70 kg human = 3 Km/hr | | | | horizontal speed would be 140 * cos 45. This reduces |
| V stride required of 60 Kg human = 4 Km/hr | | | | to about 100 Km/hr speed at discharge. The recoil |
| V stride required of 80 Kg human = 2.5 Km/hr | | | | height or the recoil velocity will not get affected by |
| The run length is a critical factor because of the | | | | the angle of delivery of the ball. It depends only upon |
| following reasons. The velocity of stride near the | | | | the height of delivery. |
| crease will depend upon the acceleration provided by | | | | Mechanics of Short ball and good length ball: |
| the bowler and the length of his run up. | | | | Short ball and length ball depend upon the height |
| V * V = 2 * a * S ( 2) ( Newton's laws of motion) | | | | from which the ball is delivered and the angle from |
| For a 140 Km/hr release of the ball at a human stride | | | | which the ball is delivered. It does not matter the |
| of 3 km/hr or.88 m/s | | | | speed at which the ball is thrown. The mechanics of |
| (fastest human speed is about 10m/s) | | | | the ball will be influenced only because of the Earths |
| 0.88 * 0.88 = 2 * acceleration * 10 ( length of run) | | | | gravitational force and no other forces. The location |
| Acceleration required = 0.032 m/sec * sec | | | | where the ball lands after leaving the bowlers hands |
| Ball recoil: | | | | will depend upon the horizontal component of the |
| The ball bounce is determined by the coefficient of | | | | velocity of release. |
| restitution. A ball will be slowed down after pitching | | | | |