Contents
Independent final check
Explain without the key
describe / calculate / state
Final check
A beam is pivoted at its middle; its own weight acts through the pivot. (a) Describe what is meant by the moment of a force. (b) A force of 25 N acts at right angles to a door, 0.40 m from the hinge. Calculate its moment about the hinge. (c) An 8.0 N weight hangs 0.25 m to the left of the beam’s pivot. Calculate how far to the right of the pivot a 5.0 N weight must hang to balance it. (d) State the two conditions for an object to be in equilibrium. (e) Supplement. With the beam balanced as in (c), a 2.0 N weight is added 0.50 m to the left of the pivot. Calculate where a 4.0 N weight must hang on the right, with the 5.0 N weight still in place, to balance the beam again. (f) Supplement. Describe an experiment to show that there is no resultant moment on an object in equilibrium.
describe: give the features or what happens. calculate: work out the answer from the data. state: give a concise answer.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
The moment of a force as a measure of its turning effect, with everyday examples (1.5.2.1); moment = force × perpendicular distance from the pivot (1.5.2.2); the principle of moments with one force each side of the pivot, including balancing a beam (1.5.2.3); no resultant force and no resultant moment means equilibrium (1.5.2.4); Supplement: the principle of moments with more than one force each side (1.5.2.5) and an experiment to show there is no resultant moment on an object in equilibrium (1.5.2.6); centre of gravity (1.5.3.1), finding it for an irregular plane lamina (1.5.3.2) and its effect on stability (1.5.3.3). Couples, torque by name, forces at an angle and levers as machines are not used. Resultant forces are in Resultant force, momentum in Momentum and collisions, and pressure in Pressure.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus