Elastic properties of solids
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-Elastic Properties of Solids . AP Physics C Mrs. Coyle. Real objects are not rigid but can deform under the influence of an external force. Remember: Hooke’s Law F=-kx. Elastic Properties of Solids. Length (Tensile Stress- Strain) Shape (Shear Stress-Strain) Volume (Bulk Stress-Strain).

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Elastic properties of solids

-Elastic Properties of Solids

AP Physics C

Mrs. Coyle


Elastic properties of solids

  • Real objects are not rigid but can deform under the influence of an external force.

  • Remember: Hooke’s Law F=-kx


Elastic properties of solids1

Elastic Properties of Solids

  • Length (Tensile Stress- Strain)

  • Shape (Shear Stress-Strain)

  • Volume (Bulk Stress-Strain)


Elasticity of length characteristics

Elasticity of Length- Characteristics

  • Tensile Strain=

Tensile Stress=F/A


Elasticity in length

Elasticity in Length

  • Tensile Stress = Y x Tensile Strain

  • Y is known as Young’s Modulus

  • Units of Y are N/m2


Tensile strength test

Tensile Strength Test

  • Tensile Strength Sample


Ex 30

Ex: #30

  • A steel wire of diameter 1mm can support a tension of 0.2kN. A cable to support a tension of 20kN should have a diameter of what order of magnitude?

  • Ans: 1cm


Elasticity in shape shear stress f a

Elasticity in Shape - Shear Stress= F / A


Example shear stress

Example: Shear Stress

http://www.fema.gov/plan/prevent/earthquake/fema74/chapter2_2.shtm


Elastic properties of solids

http://www.fema.gov/plan/prevent/earthquake/fema74/chapter2_2.shtm


Shear stress and shear strain

Shear Stress and Shear Strain

S is the Shear Modulus,

Unit : N/m2


Ex 33

Ex: #33

If the shear stress in steel exceeds 4.00x108 N/m2

the steel ruptures.

a)Determine the shearing force necessary to shear a steel bolt 1.00cm in diameter.

Ans: a) 3.14x104 N


Ex 33 cont d

Ex: #33 cont’d

b)Determine the shearing force necessary punch a 1.00cm diameter hole in a steel plate 0.500cm thick.

Ans: b) 6.28x104 N


Elasticity in volume

Elasticity in Volume

B is the Bulk Modulus

Unit: N/m2


Elastic properties of solids

  • Note that ΔF/A is pressure.


Ex 35

Ex:#35

When water freezes, it expands by about 9%.

What pressure increase would occur inside your automobile engine block if the water in it froze?

(The bulk modulus of ice is 2.00x109 N/m2 )

Ans: 1.65 x 108 N/m2


Explaining the inertia ball tensions

Explaining the inertia ball tensions.


Elastic properties of solids

  • How is ΔL affected when you have two same springs in series or in parallel pulled by the same force?


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