character: Ms. Johnson
topic: Stress and Strain in Materials
grade: 9
subject: Physics
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character: Mr. Smith
topic: Mechanical Properties of Materials
grade: 9
subject: Physics
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character: Ms. Lee
topic: Young's Modulus and Elasticity
grade: 9
subject: Physics
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character: Mr. Brown
topic: Tensile and Compressive Forces
grade: 9
subject: Physics
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