forces and elasticity

• force =spring constant ×extension


   F =k e
• force, F , in newtons, N
• spring constant, k , in newtons per metre, N/m
• extension, e , in metres, m
• a force that stretches (or compresses) a spring does work and elastic potential energy is stored in the spring
• provided the spring is not inelastically deformed, the work done on the spring and the elastic potential energy stored are equal
• elastic potential energy =0.5 ×spring constant ×(extension)^2


  Ee  = 0.5 k e^2