A reading lamp has a horizontal arm that can rotate about a pivot. The lamp head has a weight of 15 N. Its weight acts at a perpendicular distance of 0.40 m to the right of the pivot.
A counterweight is attached to the arm. The weight of the counterweight acts at a perpendicular distance of 0.25 m to the left of the pivot. The lamp arm is balanced. The weight of the arm is negligible.
Calculate the clockwise moment about the pivot produced by the lamp head.
Calculate the weight of the counterweight.
A small load is hung from the arm to the left of the pivot.
Give the side of the pivot that moves down.
124 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.