Physics (Essay) Paper 2 WASSCE (SC), 2018

Question 1

 

 

Define strain.
(b) A rubber band is stretched to twice its original length. Calculate the strain on the rubber band.

 

Observation

 

This question tested the ability of the candidates to deduce extension of a stretched rubber band and use it to calculate strain. Many candidates were able to define “strain” but most candidates mistook the stretched length for extension consequently, failed the calculation part of the question

The expected response is as stated below:

  (a) Strain is the relative distortion/change in shape/size of an object due to applied forces.