HOOKE'S LAW
3 marks · NormalA student is asked to describe the elastic behaviour of different materials.
What does it mean if a material behaves elastically?
Give an example of a material that shows elastic behaviour and one that shows plastic behaviour.
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(a) If a material behaves elastically, it returns to its original shape after the force causing the deformation is removed. · must show Returns to original shape when force removed
(b) Elastic: metal spring, rubber band (small extension). Plastic: modelling clay, putty. · must show Correct examples: (metal spring or rubber band) and (clay or putty, etc.)
Common mistakes: Confusing elastic with plastic behaviour
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States a material returns to its original shape/length after removing force.
B2 (b) · 1 mark · Gives example of an elastic material (e.g., metal spring, rubber band for small extension).
B3 (b) · 1 mark · Gives example of plastic material (e.g., putty, modelling clay).
Worked solution
(a) A material shows elastic behaviour if it returns to its original shape after the force that caused deformation is removed.
(b) Example of elastic material: metal spring; Example of plastic material: modelling clay.