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What Factors affect the height of the bounce of a ball?

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Introduction

What Factors affect the height of the bounce of a ball?

Aim:

My aim is to determine how one factor that I control can affect the height of the bounce of the ball.

Background Information:

Before a ball is released, it is stored with gravitational potential energy, which is energy dues to height. It can be calculated with the formula: Potential Energy = mass  g  height

(Where g stands for gravitational field strength, on earth it has the value of g  = 10m/s²).

As the ball is dropped the speed of the ball increases and the gravitational potential energy is converted in to kinetic energy, which is energy of movement. It can be calculated with the formula:

Kinetic energy = ½  mass  velocity².

When the ball hits the ground it begins to slow down and has no gravitational potential energy but it also starts to deform. But if there are no energy losses the total energy, potential energy and kinetic energy stays constant. The kinetic energy in the ball is used to deform the ball. Some of the energy is stored as elastic potential energy in the ball and some of the energy is converted into heat and sound. When a ball reaches zero speed

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Middle

weighing scales: to measure the weight of the ballmasking tape: to hold the rulers on place on the wall so accurate measurements can be taken.

Method:

The following instructions are how I am going to carry out my investigation:

  • Measure the ball on the weighing scales
  • Stick the rulers on the wall with the masking tape
  • Start of with the height 25 cm and let the ball go
  • Measure the height of the first rebound
  • Record the results
  • Then measure the height of the first rebound of the ball dropped at 50 cm
  • Record the results
  • And do the same with each distance as it increases

The ball I used in my experement, the material it was made out of was plastic and it weighed 5.7 grams.

Table of Results:

I conducted fives sets of the test. The reason I did this was because I wanted my results to be accurate, so I had reliable evidence to prove my prediction.

Height of Ball dropped

Height of Bounce

 1st test         2nd test       3rd test        4th test       5th test         Average

25 cm

23 cm

19 cm

20cm

15 cm

21 cm

19.6 cm

50 cm

36 cm

37 cm

39.5cm

39 cm

37.3cm

37.76 cm

100 cm

75 cm

75.5 cm

83 cm

75 cm

77 cm

77.1 cm

150 cm

112 cm

118 cm

135cm

130 cm

109 cm

120.8 cm

200 cm

150 cm

152 cm

145 cm

140 cm

151cm

147.6 cm

250 cm

230cm

235 cm

237cm

234 cm

234 cm

234 cm

Graph 1:

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Conclusion

anything in science, the results always vary whether it is slightly or greatly. If I had the opportunity I would have liked to do further work on the experiment like measuring the height of bounce at higher heights as well as working more on the energy transfers within a bouncing ball. All of this would be very useful for me in writing a firm conclusion for my investigation.

Overall, I found this experiment successful and would have liked to extended the enquiry to give me a bigger picture of the energy transfers within a bouncing ball. But otherwise it gave me a good understanding of what factors affect the height of a bounce of a ball as well as some of the energy transfers that take place while the ball is bouncing.

Pavandeep Johal 11z        -  -

Bouncing Ball Investigation

Mr Smith

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