elasticity

• an elastic material will always return to its original length or shape if we take away the forces acting on them

  = elastic deformation
• forces involved in stretching an object:

  • forces at either ends
  • with an equal magnitude but opposite direction = BALANCED forces
  • = stretch
• forces involved in compressing an object"

  • 2 squeezing forces at either end = compresses
• forces involved in bending an object:

  • 3 forces = unequal
• to change an objects shape or length, we have to apply more than one force

  if we applied only one force to a stationary object = unbalanced, so it would move rather than changing length/shape
• an inelastic material doesn't return to its original length when forces are removed

  = inelastic deformation
• force = spring constant x extension(/compression)

  F = N

  K = N/m

  e = m
• when an elastic object is stretched/compressed, a force is being used to do WORK

  = storing elastic potential energy

  provided the spring is not inelastically deformed, the work done is equal to the elastic potential energy