Moments, levers and gears — WJEC GCSE Physics
In summary: Moments, levers and gears is a key topic in WJEC GCSE Physics. Key exam tip: Always draw a diagram if one is not provided to identify the pivot and the perpendicular distance
Exam Tips for Moments, levers and gears
- Always draw a diagram if one is not provided to identify the pivot and the perpendicular distance
- Ensure units are consistent when calculating moments
- Remember that a moment is a turning effect, not just a force
Common Mistakes
- Failing to ensure the distance used in the moment calculation is perpendicular (normal) to the line of action of the force
- Confusing the pivot point with the point of force application
- Incorrectly identifying the direction of rotation caused by a force
Marking Points
- Definition and calculation of the moment of a force using the formula M = Fd
- Understanding that the distance d must be measured normal to the direction of the force
- Explanation of how levers transmit rotational effects
- Explanation of how gears transmit rotational effects
← Back to Physics WJEC GCSE Specification · All Physics Topics