# P3 Science Coursework

Topics: Potential energy, Energy, Kinetic energy Pages: 2 (518 words) Published: October 9, 2011
Bouncing Balls Coursework P3
1.Work out the average bounce height and put results in a table. Draw graph of the drop height against bounces height label axis.

2.Looking at my data, it is evident that when the drop height is 200cm for instance the average bounce height is 67cm compared to a shorter drop height of 120cm which has a average bounce height of only 50cm. This shows that when the drop height is higher the bounce height is also higher.

3.My data is good as I ensured that it was a fair test by keeping the type of ball, surface, pressure applied on the ball, balls mass and dropped repeated the experiment 3 times so therefore the data is reliable. For one of the bounce heights we got anomalous results however this could be due to human error. To improve my results I could have used a camera or transparent tube so we get accurate results as it’s hard to measure a balls bounce height with a naked eye.

Before the ball is dropped it has g.pe ( gravitational potential energy) which is converted to kinetic energy as it hits the floor. When the ball hits the ground it slows down and has no gravitational potential. It deforms changing the kinetic energy to elastic potential energy . The elastic potential is converted back to kinetic energy . When g.p.e is converted to k.e , energy is lost because of air resistance ( ball collides with air molecules) and some of the energy is converted to heat and sound energy. As the ball gets higher in the air k. e is transferred back to g.p.e. To conclude , when the drop height is increases the bounce height will increase, but not always in direct proportion .

5.
A squash ball gets very hot during a game because it bounces many times. Plan how you could test the effects of temperature in the laboratory I am planning an investigation to test the effects on a squash ball’s bounce height when it’s heated at different temperatures. What i will do is place the ball in turn into water tubs which are 10,20,30,40 and 50...