Gaining height
This online resource is a good demonstration of the transfer of energy.
The resource give details of a teacher demonstration on the energy transformations involved in a collision between a basketball and a tennis ball.
A tennis ball is positioned on top of a basketball and the two are dropped from a height. The tennis ball is spectacularly propelled high into the air when they collide with the floor.
The resource also gives a detailed explanation of what’s going on and how to take things further.