1. I am investigating how the initial height a ball is dropped from affects the rebound height. We have been asked to make a prediction about what we think will happen; however, we have not been given any guidance as to what we should write. 2. Relevant equations To find the % potential energy lost, I will use this equation: (h1-h2) / h1 * 100 where h1 = initial height ball is dropped from; h2 = rebound height of ball. 3. The attempt at a solution My prediction is, that as the initial height the ball is dropped from increases, the percentage PE (potential energy) lost by the ball will also increase. I think this is the case because at a higher height, the ball will have more PE. This will then all be converted to KE (kinetic energy) as the ball falls. Therefore, when the ball hits the ground, there will be more KE available for conversion into sound, heat and the ball's deformation so more % PE will be lost. That is what I had written in my project, but my teacher said I need to include more DETAILED SCIENTIFIC KNOWLEDGE. But I have included all I know, and tried to research as much as possible on the internet, but I can't find anymore than what I already have. Could any of you guys please help me out with detailed scientific reasons as to why my prediction is what it is? Please, I'm really freaking out! I would be so grateful!