This topic summary covers Topic Summary: Moments and Levers within Moments & Levers for GCSE Physics. Revise Moments & Levers in Forces for GCSE Physics with 13 exam-style questions and 10 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 14 of 14 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 14 of 14
Practice
13 questions
Recall
10 flashcards
Topic Summary: Moments and Levers
Key Terms
- Moment: Turning effect of a force (Nm)
- Pivot/fulcrum: Fixed rotation point
- Equilibrium: Zero resultant force and moment
- Lever: Simple machine using pivot to multiply force
Key Facts
- Larger distance from pivot = larger moment
- Principle of moments: CW moments = ACW moments (in balance)
- Levers trade force for distance (energy conserved)
- Weight acts through centre of mass
Key Equations
- M = F × d (perpendicular distance)
- For balance: Sum CW = Sum ACW
- Units: Moment in Nm, force in N, distance in m
Exam Tips
- Always use perpendicular distance
- Use W = mg to find weights first
- State "principle of moments" in 3+ mark questions
- Centre of mass for uniform object = geometric centre