Elasticity
Physics ⇒ Mechanics
Elasticity starts at 11 and continues till grade 12.
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See sample questions for grade 12
A copper wire of length 1.5 m and area 2 mm2 is subjected to a tensile force of 300 N. If Young's modulus for copper is 1.2 × 1011 N/m2, find the increase in length.
A cube of volume 0.01 m3 is subjected to a uniform pressure of 2 × 105 Pa. If the bulk modulus of the material is 1 × 109 Pa, calculate the decrease in volume.
A cylindrical rod of length 2 m and radius 0.5 cm is subjected to a tensile force of 500 N. If the extension produced is 1 mm, calculate the stress in the rod.
A metal wire is loaded with a weight and its extension is measured. If the temperature increases, what happens to the extension, assuming the load remains constant?
A rod of length 1 m and cross-sectional area 0.5 cm2 is subjected to a tensile force of 1000 N. If the extension produced is 0.2 mm, calculate Young's modulus.
A steel wire of length 2 m and cross-sectional area 1 mm2 is stretched by a force of 200 N. If Young's modulus for steel is 2 × 1011 N/m2, calculate the extension produced in the wire.
A wire is stretched by a force F, producing an extension x. If the force is doubled, what happens to the extension, assuming the elastic limit is not exceeded?
Define Poisson's ratio.
Describe the effect of increasing the cross-sectional area of a wire on its extension under a given load.
Describe the significance of the proportional limit in a stress-strain curve.
Explain the difference between elastic and plastic deformation.
Explain why rubber has a high elastic limit but a low Young's modulus.
If a rod is stretched and its length increases by 0.2%, while its diameter decreases by 0.05%, what is the Poisson's ratio?
State Hooke's Law.
