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1.5 Forces

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Question 69

A metal wire is loaded beyond its elastic limit but before its breaking point.

Which statement is correct?

A

When the load is removed, the wire returns to its original unstretched length.

B

The wire has undergone plastic deformation, so it will have a permanent extension when the load is removed.

C

Hooke's law is still obeyed up to this point.

D

As the wire is stretched beyond its elastic limit, its diameter increases.

Markscheme

1.5 Forces Questions

  1. IGCSE
  2. /Physics
  3. /1.5 Forces

245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.

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