Орал қаласы 2018 жыл

Elastic Potential Energy.

6.19. Work done by the external force in pulling the spring is stored as the elastic potential energy of the spring. The work done by external force equals the area under the force extension graph in Figure 6.20.

W_external=Area under F-x graph W_external=1/2(kx)(x) ^Wexternal^=1/2kx2

This amount of work done by the external force is stored in the spring as the elastic potential energy of the spring. Therefore, the elastic potential energy stored in a compressed or stretched spring is given by.

PE_spring=1/2 kx^{2 W}spring^{= -PE}spring

In the absence of non – conservative forces, total mechanical energy of a system does not change.