IP Physics Notes (Upper Secondary, Year 3-4): 4) Turning Forces
In one line
Apply the moment formula, balance clockwise and anticlockwise torques, locate the centre of gravity, and judge stability in real levers.
Last updated 30 Nov 2025
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- Start Here
- Moment of a Force
- Principle of Moments
- Common Moment Scenarios
Q: What does IP Physics Notes (Upper Secondary, Year 3-4): 4) Turning Forces cover?
A: Apply the moment formula, balance clockwise and anticlockwise torques, locate the centre of gravity, and judge stability in real levers.
Quick recap -- A turning effect appears when a force acts with an offset from a pivot. Balance comes from matching clockwise and anticlockwise moments while keeping the net force zero.
Start Here
| Read time | What to take away |
| 1 second | Moment equals force times perpendicular distance from the pivot. |
| 10 seconds | Balance turning effects by matching clockwise and anticlockwise moments. Stability depends on where the centre of gravity falls relative to the base. |
| 100 seconds | Use the beam and stability examples to practise marking the pivot, measuring perpendicular distances, writing moment equations, and checking force balance. |
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These notes align with SEAB GCE O-Level Physics (6091) content used in IP programmes (exams from 2026).
Status: SEAB O-Level Physics 6091 syllabus (exams from 2026) checked 2025-11-30 - scope unchanged; remains the reference for these notes.
Moment of a Force
- The moment (torque) of a force measures its turning effect about a pivot:
