When a table tennis ball is dropped as shown in Fig. 4.1, it will bounce back upwards. Some of the initial gravitational potential energy (GPE) of the ball is lost in the bounce. [Figure 4.1] Plan an experiment to investigate how the height from which the ball is dropped affects the percentage of GPE lost in each bounce. You may use any apparatus commonly found in a school laboratory in addition to the apparatus shown in Fig. 4.1. GPE is given by the equation: GPE = mgh where m is the mass of the ball, g is the gravitational field strength and h is the height above the bench from which the ball is dropped. You are not required to do this experiment. In your plan, you should: • state what you will measure (dependent variable) and any additional apparatus you may use • state any key variables to keep constant • explain how you will ensure the results are as accurate as possible • draw a table with column headings to display the results • explain how you will use the results to draw a conclusion.

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