Physics (Essay) Paper 2 WASSCE (SC), 2020

Question 1

 

 

An elastic material of length 3 m is to be stretched to produce an extension three times its original length. Calculate the force required to produce the extension if the force constant of the material is 982.3 N m-1.
Candidates were to able to write the mathematical expression of Hooke’s law and substitute correctly but some were unable to note that extension x = 3 x 3 = 9 m.

Observation

 

 

F = ke                                 
                        = 982.3 x 3 x 3        

                           = 8840.7 N