Forces and elasticity

• What is the difference between elastic and inelastic deformation?

  Elastic deformation returns to original shape
• How do you calculate the force needed to stretch an object?

  Force = spring constant × extension
• What happens to an elastic object when forces are removed?

  It returns to its original length
• What is the definition of elastic deformation?

  Change in shape that returns to original
• What is an inelastic material?

  Material that does not return to original length
• What is the formula to calculate the force required to extend a spring by $0.04 \text{ m}$ with a spring constant of $200 \text{ N/m}$?


  Force = $8 \text{ N}$
• What does the variable 'e' represent in the force calculation for elastic objects?

  Compression of the object
• What energy is stored when an elastic object is stretched or compressed?

  Elastic potential energy
• What is the relationship between work done and elastic potential energy?

  Work done equals elastic potential energy
• What are the key characteristics of elastic materials?

  • Return to original shape after force removal
  • Can be stretched, compressed, or bent
  • Changes are reversible
• What are the key characteristics of inelastic materials?

  • Do not return to original shape after force removal
  • Changes are permanent
  • Examples include certain polymers
• What steps should you follow to calculate the force needed to stretch an elastic object?

  1. Identify the spring constant
  2. Measure the extension
  3. Use the formula: Force = spring constant × extension
• What should you do if an object is subjected to only one force?

  • The object will move
  • No change in length or shape occurs