A person holds a bag of shopping in one hand. The bag has a weight of 40 N.
The person holds the bag with their arm hanging straight down by their side. The line of action of the weight of the bag passes through the shoulder joint. Give the moment of the weight of the bag about the shoulder joint.
Explain your answer to part a.
The person then holds the bag with their arm straight out in front of them. The bag is now 0.65 m from the shoulder joint. Calculate the moment of the weight of the bag about the shoulder joint.
Explain why the bag feels heavier when the arm is held straight out in front.
40 exam-style questions on AQA GCSE Physics 5.4 Moments, levers and gears, covering 5.4 Moments, levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.