Exploring ball design and material?

AL-BairaqScience in Sports 5th CycleBaseballZubaida DiamondsRaghad SultanZahra Nasser Ebtahal Alhaddad Asma AlSada

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

Ball design & materials

Why we are Exploring ball design and material? To show that sport equipment are designed to meet the requirement of specific sportsThe materials used in the equipment construction help it meet those requirement Relate the properties of those material to the way each ball functions within its sport

Its different

Type of ballMaterial made ofThe reason to use it?BaseballCow hidefor durability

Cotton yarn increasing the sizeWool yarnIncreasing the sizeCorkcentralized weight RubberTo have the ability to rebound

Activity 1: Exploring Ball Design and Materials

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Activity 2:Measuring the Rebound of Sports BallObjectives: To understand that the materials in a ball affects how high it bouncesProcedure:

COR

Type of ballDrop height m Rebound height m COR Average COR Golf ball10.070.080.100.260.280.31All divide by 3 =0.28Tennis table ball10.560.580.600.740.760.77All divide by 3=0.75

Activity 2: Compare between the rebound of two balls

Conclusion From calculations; the COR for the tennis ball is higher which is reasonable since tennis balls are designed to retain more energy and bounces high

Activity 3:Investigating Energy Absorption of Materials Objectives: To observe that surfaces may absorb energy by temporarily or permanently deforming of changing shapeProcedure:

Activity 3:Investigating Energy Absorption of Materials bored typeDrop height mRebound height mCORAverage CORPine wood10.510.500.540.710.700.73All divide by 3 =0.71Poplar wood10.490.520.500.700.720.70All divide by 3 =0.70

No big difference between both surface showed by the COR

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:

Activity 4:what is the different between two surface using tennis ball ? Description of surface Ramp height cmDistance ball rolled cmAverage distance cmFelt447454445.3Astroturf 41001009698.6

This video show our work

Design projectMaking a Baseball

How to make a good baseball ?The optimum diameter has to be 7.3to 7.6 cm The optimum weight has to be 142 to 149 g It must have the ability to rebound

Trail 1: FailMaterials used with photosTestingDiameter= 4.5Weight= 140 cmRebound= 33 cmResultsSuccess

Trail 2: Successful Changes made: more rubber bands were added TestingDiameter = 6.1 cmWeight = 154 cmRebound= 44 cmResultsSuccessful

AcknowledgmentWe would like to thank the sponsors UNESCO, Qatar National Commission, Ras Gas and Shell for giving this amazing opportunity and to be part of Al-Biaraq Also, we would like to thank Eng. Ruba Ali, Qatar University, our teachers and our school.