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I am aiming to find out how a high a ball when bounced will rebound back.

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The effects on a Bouncing Ball

Aim: I am aiming to find out how a high a ball when bounced will rebound back.

Key Factors: These are elasticity of the ball, the temperature of the room and the ball, the air pressure within the ball, the ball's surface and the type of surface it is bounced on, there is also effects if the angle of intercept is not 90° with the ground.

Fair Test: Now I know what affects the way the ball rebounds, to make the experiment fair I will need to use the same ball (a tennis ball) and on the same surface. The room temperature needs to be constant so that the bounce of the ball is not affected or changed during the experiment. I would also be dropping the ball from directly above using a wall to make sure this happens, if not than that result will not be being used. I will need to collect results for each height many times because there will be variation, I will need to get an average to help me evaluate. Also you need to drop from each

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The Experiment

Apparatus: You will need a measuring stick of 1 metre in length, a tennis ball and someone to help and a few pieces of cello tape.


Safety: Do not throw tennis balls at other, these can cause injuries, also watch out for balls on the floor because you my slip on them and fall. All obstacles need to be moved encase of accidents, you can fall over these.

Method: Here are the instructions you need to follow to do this experiment.

  • Stick the ruler directly to the wall vertically with the 0cm end touching the floor.
  • Get the other person to drop the ball at 10 cm (when this is the top of the ball), watch for the ball bouncing and measure from the top of the ball the height to the nearest ½ centre meter, this is because you will not be truthfully accurate otherwise, human vision is not good enough.
  • Repeat this 4 more times at the same height so that after you can work out an average for the height.
  • Do the same every 10 cm
  • Put all results into a results table like this one.
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There were other problems with the plan. The person who was meant to drop the ball from certain heights may have got some wrong be a small distance that would affect results; this may have been why I had those three odd results. This means the results may not be good enough to make a solid conclusion and it would be better to do the experiment again and drop the ball more accurate more times, dropping the ball more times would help make the results more reliable. I could also try dropping the ball from more heights, may be some larger ones and some in between ones like 150 cm and 45cm.

I now could get more relevant information on the Internet to find out what information there is on this area that could help my experiment. I could also do another experiment changing the heights I use and doing more drops at the same point for more accurate results to see if the same patterns appear. I could attempt to do the whole experiment again at a new temperature and see is the same trends appear still to help on going research how bouncing balls are effect and what stays the same what ever.

I think the experiment went well with good results and no major problems.

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