AL-BAIRAQSCIENCE IN SPORTS 5TH CYCLE

BASEBALL

Zubaida ScientistsShaikha Al-Thani Sara Al-Suwaidi

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

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

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

Activity 2: Measuring the Rebound of Sports BallObjectives: 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

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 0.070.080.10

0.260.280.31

0.28

Ping-Pong ball

1 0.560.580.60

0.740.760.77

0.75

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

Data

■ ConclusionNo big difference is noticed between the two surfaces

Surface Type

Drop Height (m)

Rebound Height (m)

COR Average COR

Pine wood 1 0.51 0.71 0.710.50 0.700.54 0.73

Poplar wood 1 0.490.520.50

0.700.720.70

0.70

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

■ 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 45.34544

Astroturf 0.4 100 98.610096

DESIGN PROJECT Making a Baseball

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

Results

■ Materials used with photos ■ Testing:1. Diameter = 6.5 m2. Weight = 204.4 cm3. Rebound= 22.66■ Results: Successful

Acknowledgment

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