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You should be able to find this in your introduction. State the relationship that you were expecting to find before you performed your experiment.
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Work (Force applied over a Distance, Work = Force x Distance) & where it applies in this experiment.Friction & where does it apply in this experiment.It is anticipated that bounce efficiency will remain constant despite being dropped from different heights, this is due to greater gravitational potential energy transforming into greater elastic potential energy in the tennis ball as it hits the ground, which in turn will increase the bounce height accordingly. It is expected that as the drop height increases, so will the bounce height to a limited extent. This is similar to the 'because' statement in the hypothesis, but it is explained here at length. What you expect to happen with your full reasoning - links to theory. Bounce efficiency is then calculated by the following formula:īounce efficiency = bounce height / drop height x 100%
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The effect of changing the drop height on the bounce efficiency is found by measuring the resulting bounce height using a meter ruler and sighting the rebound as close to right angles to the ruler as possible to minimise parallax errors.
![if the ball is red then it will bounce higher if the ball is red then it will bounce higher](https://thumbs.dreamstime.com/x/red-ball-bounce-22124337.jpg)
This is the dependent variable because it will change in response to the changes made in the bounce height due to the different amounts of gravitational potential energy involved.Ī little information on any calculations you will use - particularly if they are uncommon like the one used below. The effect of changing the drop height will be measured by calculating the bounce efficiency of the tennis ball. The variable to be changed in the experiment is the drop height, therefore the drop height will be the independent variable investigated. Discussing the variables involved in this experiment.
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