2. Methods

2. Methods 

2.1 Equipment List 

The 3 Retort stands, three clamps, mini trap door made of a stiff material, a phone or camera, a ruler, string.

2.2 Diagrams of the experimental setup  

Image Credit: Ethan Chan Song Yi, Goh You Jun, Kottaimuthu Shrinithi 

Figure 1: Experimental setup 

2.3 Procedures

1. Go to a location with no wind and a concrete floor.

2. Attach the clamps at 0.5m on the retort stand next. 

3. Place a trap door directly horizontal to the frame and a 1m ruler next to the retort stand. 

4. Attach strings from the trap door and pull up on the string lightly. 

5. Place the ball on the trap door.

6. Ensure that the trap door is completely closed.

7. Ensure that the ball is not rolling, then start recording.

8. Release the string and let the ball drop

9. Stop the recording

10. Repeat steps 3-8 two more times.

11. Go to a location with no wind and a grass floor and repeat steps 2-10.

12. Go to a location with no wind and a tile floor and repeat steps 2-10.

13. Go to a location with no wind and a clay floor and repeat steps 2-10.

14. Go to a location with no wind and a turf floor and repeat steps 2-10.

15. Go to a location with no wind and a wood floor and repeat steps 2-10.

16. Use logger pro and calibrate the ruler to 1m

17. Track the ball for each shot in logger pro

18. Record down the ball's height when it is at its highest point after the bounce on a table.

2.4 Data Analysis

To perform the data analysis, we have to Find the average measurement ( how high the ball bounces ) for each surface, write and type the measurements into a table, each column for a distinct surface, and each row for the height of bounces. And then plot a histogram of rebound height against the type of surface. Finally, we compare the histogram and find the best surface after calculating and adding the error bar. After that, we compare the results with research values from the internet. The coefficient of energy loss is calculated using the formula CEL = 50-H50*100%, and the coefficient of rebound by using the formula CB = H50*100%

This is the graph we will use:

Image Credit: Ethan Chan Song Yi, Goh You Jun, Kottaimuthu Shrinithi

2.5 Risk Assessment and Management

Risk	Assessment	Management
The retort stand may fall over, and the trapdoor may hit our feet.	Medium	Add some weight to the retort stand to prevent it from falling.
The ball might be released and drop on the feet of someone.	Small	Stand a safe distance away and keep people out.
The ball may rebound and hit the eye of the person recording the video of the bounce.	High	Have the person who is videoing the experiment wear safety goggles
The retort stand might trip someone who walks by	Medium	Keep people away