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Physics Paper 2, MAy/June. 2009  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength













Question 7

Explain the following terms:
  • tensile stress;
  • Young’s modulus
_____________________________________________________________________________________________________
Observation

Explanation of tensile stress and Young’s modulus were poorly stated by majority of the candidates.  While many scored for valid additional information, many others failed to relate tensile stress with a wire or rod.

The expected answers are:

(a) Tensile stress is the ratio of force  to  cross-sectional area of a wire/rod                                                                           
            It is expressed in Newton per metre squared (Nm-2) 
                       
(b) Young’s modulus is the ratio of tensile stress to tensile strain. It is expressed in Newton per metre squared. (Nm-2)                         

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