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International A LevelPhysicsEdexcelExam Questions1. Mechanics & MaterialsStretching Materials

Stretching Materials (Edexcel International A Level Physics)

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Stretching Materials

1
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A wire breaks when a tensile force T is applied. A second wire, made of the same material, has twice the diameter.

Which of the following is the force required to break the second wire?

  • 4 T

  • 2 T

  • T over 2

  • T over 4

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2
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Two different springs, straight S subscript 1 and straight S subscript 2, are suspended from a fixed support. Masses are attached to the bottom of straight S subscript 1 and straight S subscript 2 as shown.

q3-wph11-01-oct-2021-edexcel-int-as-and-a-level-phy

The extension of straight S subscript 1 is x, and the extension of straight S subscript 2 is x over 3. The elastic strain energy in spring straight S subscript 1 is E.

Which of the following is the elastic strain energy in spring straight S subscript 2?

  • 6 E

  • fraction numerator 3 E over denominator 2 end fraction

  • fraction numerator 2 E over denominator 3 end fraction

  • E over 6

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3
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A compressive force F is applied to an object made of a material with Young modulus E. The original length of the object in the direction of the force is x, and its cross‐sectional area is A.

Which expression gives the length of the object after the force is applied?

  • x space minus space fraction numerator A E over denominator F x end fraction

  • x space plus space fraction numerator F x over denominator A E end fraction

  • x space plus space fraction numerator A E over denominator F x end fraction

  • x space minus space fraction numerator F x over denominator A E end fraction

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4
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A copper rod was placed under tensile stress and the tensile strain in the rod was measured.

The graph shows how the tensile stress required to cause a tensile strain in the rod depends upon the tensile strain.

q9-wph11-01-june-2021-edexcel-int-as-a-level-phy

What does point X represent?

  • the fracture point of the rod

  • the limit of proportionality for copper

  • the maximum tensile stress in the rod

  • the yield point of copper

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