A Levels Physics

A rubber cord hangs from a rigid support. A weight attached to its lower end is gradually
increased from zero, and then gradually reduced to zero.
Z///////
force
stretching
rubber
cord
contraction
weight-
extension
The force-extension curve for contraction is below the force-extension curve for stretching.
What does the shaded area between the curves represent?
A the amount of elastic energy stored in the rubber
B the amount of thermal energy dissipated in the rubber
c the work done on the rubber cord during stretching
D the work done by the rubber cord during contraction


Deformation of Solids | 2013 - M/J - 9702/12 | Q22