extension

• How many forces are required to compress, bend, or stretch an object?

  More than one , it takes multiple forces ( in different directions) to deform an object
• What is the relationship between force applied and extension of an elastic object?

  Extension is directly proportional to force applied , provided that the limit of proportionality is not exceeded
• What is meant by inelastic (plastic) deformation?

  a deformation which results in the object being permanently changed , the object doesnt change back to its original shape once the force has been removed
• What is the equation relating force, spring constant, and extension?

  Force = Spring Constant x Extension
• What are the units for force, spring constant, and extension?

  Force (N), Spring Constant (N/m), Extension (m)
• What type of energy is stored in a spring when it is stretched?

  Elastic potential energy
• What can extension be replaced with in the equation for spring force?

  Compression
• Differentiate between elastic and inelastic distortion.

  • Elastic distortion: Temporary change, reverts back once forces are removed
  • Inelastic distortion: Permanent change, irreversible
• How can you calculate the work done/stored in stretching a spring?

  Energy = ½ x Spring constant x Extension²
• What is the formula for work done in stretching a spring?

  E = ½kx²
• When is there a linear relationship between force and extension?

  When an object is deforming elastically, when it has not yet reached the proportionality limit
• When is there a nonlinear relationship between force and extension?

  When the limit of proportionality has been exceeded , and the object is undergoing plastic deformation