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Young's Modulus

Stiffness of material. Young Modulus = Stress/Strain. In GPa or

Stress = Force applied/Cross sectional Area. In Nm^2 or GPa
Strain = Extension/Original Length. No units.
Density = Mass/Volume

Elastic or Plastic
No material is absolutely rigid. Even a concrete floor changes shape as you walk across…

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Kevlar is tough it can withstand shock and impact.
Mild steel is durable it can withstand repeated loading and unloading.
Diamond is hard it cannot be easily scratched.

Storing Energy

Some elastic materials are intended to absorb energy. The more a material is extended, the greater the
force required.

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