AL-Bairaq Science in Sports 5 th Cycle Baseball Al-Shaymaa School for Girls Pythagoras Group Fatima Al-Suwaidi Hanan Al-Ali Moza Al-Kubaisi Haya Maarfi
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AL-BairaqScience in Sports
5th CycleBaseball
Al-Shaymaa School for GirlsPythagoras Group
Fatima Al-Suwaidi Hanan Al-Ali Moza Al-Kubaisi Haya Maarfi
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 The design of balls varies according to
how the balls are used in their sport. Different materials give different properties
Materials scientists are at the forefront of new technology, pushing forward the boundaries of science and engineering with designers and engineers of every discipline
Activity 1: Exploring Ball Design and Materials
Objectives:Of what the ball is made up and what are the substances found in the ball Procedure: We cut a football and observed the materials making it and its purpose
Results:
ConclusionBalls are made from composition of materials to combine between the different properties required. Almost all sports materials are made this way
Ball Materials made of
Reason
footballRubber For good
reboundplastic For durability
Pressurized Air For bouncy
Activity 2:Measuring the Rebound of Sports Ball
Objectives:To measure the rebound of tennis ball and golf ball and compare the rebound of both Procedure: two balls were dropped on the same wooden surface
from one meter height and the rebound was measured using a ruler
Coefficient of Restitution “COR” COR shows how much of the kinetic energy
remains for the objects to rebound vs. how much energy is lost
COR is a ratio between 0 and 1 and it shows how high the ball will rebound once dropped
Higher COR indicates higher rebound
Results:
Conclusion:Tennis ball has higher rebound than the golf because of the materials composing it. It also has higher COR which indicated the balls ability to rebound
Type of ball
Drop height (cm)
Rebound height(cm)
COR Average COR
Tennis 100 59 0.77 0.7760 0.7761 0.78
Golf 10015 0.39 0.3815 0.3914 0.37
Activity 3: Investigating Energy Absorption of Materials
Objectives:Comparing between the absorption of energy of oak wood and poplar wood interns of rebound height Procedure: a golf ball is dropped on two surfaces to
observe the rebound and energy absorption
What happens when a ball is dropped on surface Some of the energy is returned to the ball and
hence it bounce back and some of the energy is lost in Friction Air resistance Heat Deformation of the surface
Results: Ball used: Golf ball
Conclusion1. Poplar wood deformed because it absorbed energy 2. COR changes according to the surface and the material of the ball
Surface Type
Drop Height (cm)
Rebound
Height (cm)
COR Average COR
Deformation of
Surface
Oak wood 100
46 0.67 0.67 no47 0.6849 0.70
Poplar wood
100 50 0.70 0.70 yes50 0.7051 0.71
Activity 4: Comparing Rolling Friction on Different Surfaces ObjectivesComparing the friction of baseball on two different surfaces ProcedureOne ball is rolled on two surfaces and the crossed distance is measured
Results
ConclusionEach surface exhibits friction to some degree and it affects how far the ball travel. Felt has proven to have less friction is ball cross more distance on it.
Description of
Surface
Ramp Height cm
Distance ball Rolled
cm
Average Distance
cmArtificial grass 4
383939
40Felt
459
48.64740
Design ProjectMaking a Baseball
ObjectivesBaseball is a bat-and game played between two teams of nine players each who take turns batting and fielding. Our objective is to make a baseball more from new and creative materials which are common and accessible
Trail 1 Materials made of: Wool - tissues –
Baber - Rubber Weight :- 24 g Diameter 4.5 cm Rebound 35 cm Results :- Fail
Trail 2
Materials made of: Wool - Rubber - cotton – small bounce Ball
Weight :- 197.4 g Diameter :- 7.4 cm Rebound :- 65 cm Results :- success
AcknowledgmentI want to thank my friend who is working with me to make our ball , and I would like to thank ruba parameter That gave us the workshop , In addition to chemistry teachers and school administration , Also, I would like to thank the sponsors UNESCO, Qatar National Commission, Ras Gas and Shell.
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