P2.17 Elasticity, Spring Constant & Hooks Law

• What are the different types of elasticity discussed in the video?

  Elastic and inelastic deformation
• What does the term 'spring constant' refer to?

  It measures stiffness of a spring
• What is Hooke's Law?

  Force is proportional to extension
• What happens when a force is applied to an object?

  It can compress, stretch, or bend
• Why is it easier to see deformation in a spring than in other objects?

  Springs are more elastic than other objects
• What do we call the change in shape of an object?

  Deformation
• What are the two types of deformation?

  Elastic and inelastic deformation
• What is elastic deformation?

  Object returns to original shape after force removal
• What is inelastic deformation?

  Object does not return to original shape
• What is extension in the context of springs?

  Increasing length of a spring when stretched
• What happens to a spring's length when a mass is added?

  Its length increases due to extension
• What force acts on a spring when it is hanging?

  The weight of the spring itself
• What does the spring constant (k) indicate?

  How much force is needed to stretch the spring
• How is the relationship between force and extension expressed mathematically?

  $f \propto e$
• What does a higher spring constant indicate?

  The material is stiffer and harder to stretch
• What does a straight line graph of force against extension indicate?

  Force and extension are directly proportional
• What is the elastic limit?

  The point where Hooke's Law no longer applies
• What happens after the elastic limit is reached?

  The object may not return to its original shape
• What are the key concepts related to force and extension in springs?

  • Force is proportional to extension: $f \propto e$
  • Spring constant (k) measures stiffness
  • Hooke's Law applies until elastic limit is reached
  • Elastic deformation returns to original shape
  • Inelastic deformation does not return to original shape
• What does the term 'deformation' mean?

  Deformation refers to the change in the shape of an object, as a result of forces being applied to it.
• What is 'elastic deformation'?

  Elastic deformation is a change in the shape of an object, which can be reversed once the forces causing it have been removed.

  So the object will return to its original shape.
• What is 'inelastic deformation'.

  Inelastic deformation is a change in the shape of an object, which cannot be reversed once the forces causing it have been removed.

  So the object will not return to its original shape.
• Inelastic deformation.

  
• Elastic deformation

  
• What is the minimum number of forces required to stretch, compress, or bend an object?


  Two forces.

  (If only one force is applied then it would cause the object to accelerate instead)
• What does the term 'spring constant' mean?


  An object's spring constant is a measure of how many Newtons of force it would require to stretch (or compress) the object by 1 metre. It has the units N/m. (its basically a measure of how firm, or stiff, a spring is).

  A higher spring constant means the spring is more firm (harder to stretch).

  A lower spring constant means the spring is less firm (easier to stretch).
• Which would have a higher spring constant, an elastic band, or a hosepipe?


  A hosepipe would have a much higher spring constant as it would require much more force to stretch.
• What is Hooke's Law?


  Hooke's Law states that the extension of an object is directly proportional to the force applied. It can be described by the formula : F=Ke
• What is the 'elastic limit'?


  The point at which an object being stretched stop deforming elastically, and starts deforming inelastically.
• Limit of proportionality.