Hooke ’ s Law. Elasticity: The ability of an object to return to its original shape after the deforming force is removed.

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Hookes Law The following topics will be discussed in this presentation: 1. Hookes law 2. Elastic behaviour of materials by stretching a spring and producing.

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Presentation transcript:

Hooke ’ s Law

Elasticity: The ability of an object to return to its original shape after the deforming force is removed.

Types of Elasticity: Extension – Stretch Compression – Squeeze Torsion – Twist Flexion - Bend

Extension Trampoline springs

Compression Shock absorber

Torsion Rat Trap

Flexion Diving board

Robert Hooke: In 1678 Robert Hooke studied elasticity and found that within the limits of perfect ELASTICITY Strain is directly proportional to Stress. This is known as Hooke ’ s Law

Stress: The applied force or the weight of the object that causes a spring to stretch. Stress is a measurement of Force and is always measured in Newtons (N) F = ma

Strain: The change in shape The amount of stretch in a spring. Strain is a measurement of Distance and is always measured in Meters.

Hookes experimental set up

Our experimental set up

Formulas: F Change in Force Measured in (N) Elastic Constant Labeled as Newton/meters (N/m) K =F / L F = L x K L = F/K K L Change in length Measured in (m)

Elastic Limit: The point at which too much stress is applied and the spring will not return to its original shape.

DON ’ T DO THAT !!