Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
THE TURNING EFFECT OF FORCES
24 practice questions
Practice questions
11–13 of 13 · Normal
Question 11
4 marks · Normal
Answer and see the solution →A uniform horizontal rod of length 1.8 m and weight 90 N is supported at its two ends, labelled P and Q. A load of 60 N is hung from the rod, 0.3 m from end P.
(a)[3 marks]Taking moments about point P, calculate the upward force at Q.
(b)[1 mark]State the upward force at P.
Question 12
2 marks · Normal
Answer and see the solution →Diagram Force (N) Distance from pivot (m) Angle to lever arm (°) A 40 0.2 90 B 60 0.1 0 C 80 0.05 90 D 100 0.01 90 Look at the table showing different forces applied to a door at various distances and angles from the hinge (pivot).
Question 13
3 marks · Normal
Answer and see the solution →A bridge is supported at both ends. A heavy truck stops near the left end of the bridge. Explain, using the principle of moments, how the upward forces at the left and right supports change as the truck moves from the left end to the centre of the bridge.