In the sports materials module, the design and materials of sports balls are studies. The factors that affect how a ball rebound are also explored. The design project is the make a baseball form new and innovative materials however; it should have similar specifications to the original official league baseball. The project is done by Scientists group from Zubaida Secondary school for Girls.

1. AL-BAIRAQ
SCIENCE IN SPORTS 5TH CYCLE
BASEBALL
Zubaida Scientists
Shaikha Al-Thani Sara Al-Suwaidi

2. Outline
■ Introduction
■ Activity 1: : Exploring Ball Design and
Materials
■ Activity 2:Measuring the Rebound of Sports
Ball
■ Activity 3:Investigating Energy Absorption
of Materials
■ Activity 4: Comparing Rolling Friction on
Different Surfaces
■ Product Idea: Making a Baseball

3. Introduction
■ In this presentation we will be going through
the activities we did in Al-Bairaq workshop.
At the end we were able to come up with a
new innovative design for baseball

4. Activity 1: Exploring Ball Design
and Materials
■ Results: ‫جدول‬ ‫في‬ ‫النتائج‬
■ Conclusion: what we knew is that the soccer ball contains
pressurized air for rebounding the ball and it also contains of
synthetic rubber for durability.
Ball Materials made of Reason
Soccer Ball Pressurized air For rebound
Synthetic rubber Durability

5. Activity 2: Measuring the
Rebound of Sports Ball
Objectives:To understand how the materials in the ball affects its
rebound height.
Procedure:Test Ping-Pong ball and golf ball for bouncing back after
dropping from 1 meter

6. Data
■ Conclusion:The tennis ball has a higher rebound height
instead of the golf ball and the tennis ball has higher
coefficient of restitution.
Type of ball Drop
height m
Rebound
height m
COR Average COR
Golf ball 1 0.07
0.08
0.10
0.26
0.28
0.31
0.28
Ping-Pong
ball
1 0.56
0.58
0.60
0.74
0.76
0.77
0.75

7. Activity 3: Investigating Energy
Absorption of Materials
Objectives: Some surface absorb energy more than others. In this
activity we find out which surface absorb less hence more efficient
Procedure: On pine and poplar wood surface a ball was thrown and
the bounce back distance was measured using a ruler

8. Data
■ Conclusion
No big difference is noticed between the two surfaces
SurfaceType Drop Height (m) Rebound Height
(m)
COR AverageCOR
Pine wood 1 0.51 0.71 0.71
0.50 0.70
0.54 0.73
Poplar wood 1 0.49
0.52
0.50
0.70
0.72
0.70
0.70

9. Activity 4: Comparing Rolling
Friction on Different Surfaces
Objectives:To demonstrate the amount of friction between two
objects varies according to the surface properties of the object.
Procedure: Allow a ball to roll on two types of surfaces and by the
ruler measure the distance covered

10. ■ Results:
■ Conclusion:
Astroturf has less friction and hence the ball cross more distance.This is why
its used in football feilds
Description of
Surface
Ramp Height Distance ball Rolled Average Distance
Felt 0.4 47 45.3
45
44
Astroturf 0.4 100 98.6
100
96

11. DESIGN PROJECT
Making a Baseball

12. The Requirements
■ Diameter has to be 7.3 to 7.6cm
■ Weight has to be 142 to 149 g
■ It must have the ability to rebound

13. Results
■ Materials used with photos
■ Testing:
1. Diameter = 6.5 m
2. Weight = 204.4 cm
3. Rebound= 22.66
■ Results: Successful

14. Acknowledgment
I would like to thank the sponsors UNESCO, Qatar
National Commission, Ras Gas and Shell. Also Qatar
University for giving us this opportunity