Ball bounce-off

What happens to a wave as it hits a surface it cannot pass through

Does the energy (density of a ball) affect the waves path
For an in class assignment, we tested what would happen to a source of energy when it hits a surface it cannot pass. We took 3 different balls of different density's and put then up against the wall. The first ball we tested we made of packed Styrofoam. It was very light weight and had very little density. when we rolled it up against the wall it bounced right back in the same direction. We predicted that this was because it had very little density, it hit the wall with less force, so the opposite force was small. Next, we tested a marble. The marble was small but very dense and we knew that the results of this test were going to be very different then the Styrofoam. When we threw the marble, it came back at an angle that made a path that looked like a 1. This is something called the angle of reflection. The angle of reflection is the angle between the reflected wave and the imaginary perpendicular line. We predicted that this was because the marble was dense, so the opposite force was greater. Finally we tried the golf ball. This test was a lot like the one with the marble, because the golf ball was also dense and we knew that the results were going to be similar. When we tested the golf ball it made the same 1 shape because of the forces it was up against. From this test we can conclude that when a source of energy hits a surface it cannot pass through, the density will effect the force and the path the wave shoots back on.