Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
HOOKE'S LAW
16 practice questions
Practice questions
1–2 of 2 · Hard
Question 1
5 marks · Hard
Answer and see the solution →A student is testing the behaviour of a metal wire using the setup below. She measures its original length as 80.0 cm. She applies a series of increasing forces and records the following lengths:
Force / N Length / cm 0 80.0 2 80.4 4 80.8 6 81.2 8 81.6 10 82.8 (a)[2 marks]Calculate the extension produced by each applied force, entering your answers in cm.
(b)[3 marks]Identify between which two forces the wire most likely stops obeying Hooke’s law, and justify your answer using the data.
Question 2
5 marks · Hard
Answer and see the solution →A designer is choosing materials for a chair. The seat uses metal springs under a cushion, while the backrest is made of a plastic sheet. Both materials can be squashed or stretched slightly when someone sits on the chair.
(a)[3 marks]Explain why using springs with elastic behaviour is suitable for the seat, but the plastic sheet is less suitable if elastic behaviour is required for comfort.
(b)[2 marks]State one reason why it is important for the springs to return to their original shape after the load is removed.