character: Dr. Patel
topic: Mechanical Properties of Solids: Stress and Strain
grade: 9
subject: Physics
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character: Mr. Smith
topic: Introduction to Stress in Materials
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Understanding Strain in Solids
grade: 9
subject: Physics
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character: Mr. Lee
topic: Elastic and Plastic Deformation in Materials
grade: 9
subject: Physics
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