Hooke’s Law

Question 1

What happens if force applied on a spring (or whatever elastic material is too large)

Answer 1

• elastic limit reached (limit of proportionality)
• spring no longer returns to its original shape (permanent deformation)

Question 2

Does it obey Hooke’s law experiment (10)

Answer 2

• measure original length using ruler
• add a (known force / load / weight)
• measure new length / extension
• repeat for range of values of load
• reduce parallax error by taking measurements at eye level / repeat and average for each load
• calculate extension
• plot graph of extension against force / weight / load
• graph should be a straight line
• extension graph should pass though origin
• force proportional to extension