SUPER BOUNCY BALL - Telugu
Channel: Arvind Gupta
Date: 2015-12-16

We will defy conventional science and gravity by bouncing the ball much higher than you would imagine. The smaller ball becomes super bouncy going up almost nine times more to about 18-ft. Let’s play with the super bouncy tennis ball and understand the physics behind it.
When a single ball is dropped from about 4-ft, it retains about 70% of its speed after striking the ground. Hence it bounces half the original height 0.7 times 0.7 to about 2-ft. This is roughly same for all three types of balls.
Every moving thing has a momentum which is its mass multiplied by its speed. And in case of a collision the total momentum of colliding bodies is same before and after collision. 
Football weighs about six times the tennis ball. So the momentum of football is six times more.
After striking the ground the tennis ball basically takes half the momentum of the football. So the football now bounces less from 2-ft to 1-ft. And tennis ball bounces more. Since the tennis ball is about six times lighter its speed increases 3 times. So it goes about 9 times the distance to about 2-ft times 9 or 18-ft. Remember when speed doubles ball goes 4 times.

This work is supported by IUCAA (www.iucaa.ernet.in) and TATA Trust (www.tata.com/aboutus/sub_index/Tata-trusts)

Credits:,Ashok Rupner, Manish Jain, Shivaji Mane, Jyoti Hiremath, Arvind Gupta, Vidula Mhaiskar, Gunjan Rupner

SRI PRAKASH VIDYANIKETAN Visakhapatnam A. P TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org