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To investigate how the temperature of a squash ball will affect the height of it bouncing off the floor when it is dropped from the height of 1m.

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PHYSICS SQUASH BALL INVESTIGATION Edd Kiggins PHYSICS INVESTIGATION Aim To investigate how the temperature of a squash ball will affect the height of it bouncing off the floor when it is dropped from the height of 1m. Possible Variables Temperature of Ball Temperature of surroundings Height of ball when dropped Freezing the ball Punching a hole in the ball Damaging the surface area of the ball Dropping the ball onto different surface areas. Prediction "Resilience is the extent to which a material stores energy under deformation. The rebound resilience for a ball is related to elasticity. Elasticity deals with those substances that have the property of recovering their size and shape when the forces producing deformations are removed. The atoms inside an elastic material are modelled as masses interconnected by an array of 'springs' (chemical bonds) in a complex vibrating structure. The higher the temperature of the ball the greater the vibration of the springs." The New Standard Encyclopaedia, 1954 Edition When a ball hits a hard surface the kinetic energy (which all moving objects have) of the ball's motion rapidly compresses the springs in the direction of motion while the springs parallel to the wall are rapidly stretched. When ball reaches zero velocity we have maximum compression and stretching of the springs and the total energy in the ball is momentarily held in the elastic energy in the springs. ...read more.


* Then take the squash ball and place it on the table in the room for three minutes. It should, after three minutes, be at room temperature (20�C). * I will then take the ball and drop it from 1m and record how high it bounces. I will repeat this three times, on after another. * Then take the same ball and put it in a sandwich bag and seal it with a rubber band. This is to prevent damage from the water. * Then I will place the ball in a water bath with a high temperature and wait for the ball to reach 5?c higher. Take out and drop again three times. * Place the ball back into the plastic bag and back into the water bath until another rise of temperature of 5?c. I will then take the ball out of the plastic bag and again drop it from a height of 1m. I will repeat this three times, one after another. * I will repeat this procedure until 60?c. Results Temperature (?c) Test 1 Test 2 Test 3 Test 4 Test 5 Avg. Height 15?c 13 14 12 14 14 13.4 cm 20?c 21 20 21 21 22 21 cm 25?c 23 26 26.5 26 25.5 25.4 cm 30?c 28 27 29 28.5 27.5 28 cm 35?c 33 34 33 37 33 34 ...read more.


Thirdly, I could have repeated the experiment another three times to make sure it was a fairer test. These three things could have made my results more precise, reliable and would have improved it. I still think that this evidence is sufficient enough to support the following conclusion: "The higher the temperature of the squash ball, the higher it will bounce." This is because of the fact that my results showed that the higher the temperature of the squash ball the higher it bounced. For example when it was at 15�C it bounced an average 13.4 centimetres high and when it was at 60�C it bounced an average of 60 centimetres high. This is shown very clearly on graph. If I were to do further work on how the temperature of a ball affects it's height then I would do the same experiment using tennis, table tennis and footballs and measure the height they bounce to at different temperatures. I would also do the same experiment with squash balls that have different speeds (for example one with a yellow dot or a blue dot). This would help me draw a clearer conclusion on the relationship between the temperature of a ball and the height that it bounces to. ...read more.

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