A L - B A I R A QS C I E N C E I N S P O R T S 5 T H

C Y C L E

Z U B A I D A U N I Q U E M A H A A L - G H A N I M R O U D A A L - M A D E E D

S A R A M O H A M M E D M A RYA M M O H A M M E D

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

• During the time we worked with Al-Bairaq team we studied a lot about different materials and material science. Many activities were performed from which valuable information was withdrawn. • Finally we were able to come up with our own baseball

design from new mateirals

ACTIVITY 1: EXPLORING BALL DESIGN AND MATERIALS

• Objectives: To show that sports equipment's are designed to meet the requirement's of the specific sport and that are the materials used in the equipment's construction help it to meet those requirements

• Procedure: A tennis ball was cut in two and the inside materials was observed to conclude the objective of each material

Ball Material used Tennis Rubber Create a pocket to

keep airWool Provide rough surface

better grip on groundPressurized air Bouncy

ACTIVITY 2: MEASURING THE REBOUND OF SPORTS BALL

• Objectives: Measure the Coefficient of Restitution and Rebound of tennis ball and racket ball after being dropped on the same surface

• Procedure: Drop the two balls from 1 m height on oak wood surface and measure the rebound using a ruler

TYPE OF BALL

DROP HEIGHT (cm)

REBOUND HEIGHT (cm)

COR Average COR

Tennis ball 100 404142

0.630.640.65

0.64

Racket ball

100 706869

0.840.820.83

0.83

DATA

• ConclusionThe COR or coefficient of restitution is a ratio that shows how high a ball will bounce back after a drop. Since racket ball has higher COR it means it can retain more energy and hence rebound higher than a tennis ball on the same surface.

ACTIVITY 3: INVESTIGATING ENERGY ABSORPTION OF MATERIALS

• Objectives: To observe that surface absorb energy after collision by temporarily or permanently deforming of changing shape which is indicated by the rebound height of the ball

• Procedure: A racket ball was dropped on poplar and pine wood surfaces to see on which surface the ball with bounce back higher

SURFACE TYPE

DRAF HEIGHT (cm)

REBOUND HEIGHT (cm)

COR AVERAGE COR

DEFORMATION OF SURFACE

• Popular wood

• 100 • 65• 66• 67

• 0.81• 0.81• 0.82

0.81 NO

• Pine wood

• 100 • 50• 52• 53

• 0.71• 0.72• 0.73

0.72 YES

DATA

• ConclusionIts observed that the ball bounced higher on poplar wood since its absorb more energy than the pine wood. Unlike poplar wood pine wood has deformed.

ACTIVITY 4: COMPARING ROLLING FRICTION ON DIFFERENT SURFACES

• Objectives: In this activity two surface were examined for surface roughness and friction. The objective is to determine which surface has less friction for the ball to roll on

• Procedure: The ball used in this activity is ping pong ball on two surfaces synthetic grass and foam

DATA

• Conclusion: The ball rolls more distance on the foam surface than the synthetic grass since the friction is less

Average distance cm

Distance ball rolled cm

Ramp height cm

Description of surface

43 46 4 Synthetic grass40

4373 72 4 Foam

7473

DESIGN PROJECT: MAKING A BASEBALL• Materials Used to Make the Ball

• Diameter = 7 cm• Weight = 149.6• Rebound = 48.3 cm

ACKNOWLEDGMENTA thank you is dedicated to my group and my frirends, Qatar University and Eng. Ruba. Also, I would like to thank the sponsors UNESCO, Qatar National Commission, Ras Gas and Shell.