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Hooke’s Law and Young’s Modulus Revision

Hooke’s Law and Young’s Modulus Revision

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Page 1: Hooke’s Law and Young’s Modulus Revision

Hooke’s Law and Young’s Modulus Revision

Page 2: Hooke’s Law and Young’s Modulus Revision

Define these terms:

• Stress

• Strain

• Extension

• Length

• Compression

• Tension

Page 3: Hooke’s Law and Young’s Modulus Revision

Hooke’s Law

This is the force applied (N)

This is the extension (m)

Page 4: Hooke’s Law and Young’s Modulus Revision

We can write it another way

This is the force applied (N)

This is the gradient (N/m) and is unique for each spring

This is the extension of the spring (m)

Page 5: Hooke’s Law and Young’s Modulus Revision

Young’s Modulus

Page 6: Hooke’s Law and Young’s Modulus Revision

Elastic Movement in Metals

Atoms are stacked in planes as +ve ions in a sea of -ve free electrons.

When stress is applied to the metal, the +ve ions will start to spread apart.

The atomic bonds stretch, and the attractive forces between the atoms will oppose the applied stress, like millions of tiny springs.

If the metal has not yielded, the interatomic forces will pull the metal back into its original shape when the stress is removed.

Page 7: Hooke’s Law and Young’s Modulus Revision

Elastic Movement in Metals

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