Forces and Elasticity

• What must act on a stationary object to change its shape?

  More than one force
• What are the two types of deformation?

  Elastic and inelastic deformation
• What happens to an elastic object after forces are removed?

  It returns to its original shape
• Give an example of an elastic object.

  A spring
• What happens to an inelastic object after forces are removed?

  It does not return to its original shape
• What is the force-extension relationship for an elastic object?

  Extension is directly proportional to load
• What is the formula for the force-extension relationship?

  F = k * e
• What does a linear graph indicate in the force-extension relationship?

  Extension is proportional to force
• What does the spring constant represent?

  Stiffness of the spring
• What happens to energy in elastic deformation?

  All energy transfers to potential energy store
• What is done when a force stretches or compresses an object?

  Work is done
• What is the limit of proportionality in a force-extension graph?

  Point where extension is no longer proportional
• What happens when the force exceeds the limit of proportionality?

  The graph becomes non-linear
• How does the spring constant affect energy transfer?

  Larger spring constant means more energy transferred
• What is the relationship between extension and energy transferred?

  More extension means more energy transferred
• What are the key concepts of forces and elasticity?

  • More than one force changes shape
  • Types of deformation: elastic and inelastic
  • Elastic objects return to original shape
  • Inelastic objects do not return to original shape
  • Force-extension relationship: extension proportional to load
  • Work is done when stretching or compressing
  • Energy stored as elastic potential energy