Exercise 1 — IGCSE 0653 May/Jun 2023 Paper 41 Q5
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C H
Cambridge IGCSE·Combined Sciences 0653·Chemistry
Forces
Key knowledge — Forces
Formulas & equations
Weight = mass × gravitational field strength (W = mg)Newton's 2nd law: F = maMoment = force × perpendicular distance from pivotPressure = force ÷ area (P = F/A)Hooke's law: F = kx (extension proportional to force, up to elastic limit)Momentum = mass × velocity (p = mv)Impulse = force × time = change in momentum (Ft = Δmv)
Key facts & rules
- Newton's 1st law: object stays at rest or constant velocity unless acted on by a net force.
- Newton's 3rd law: every action has an equal and opposite reaction (different objects, same type of force).
- Terminal velocity: when drag force = weight → net force = 0 → constant velocity.
- Principle of moments: for equilibrium, sum of clockwise moments = sum of anticlockwise moments.
- Centre of gravity: point where weight acts. Lower CG = more stable.
- Friction: force opposing relative motion between surfaces.
IGCSE Chemistry — Forces
1 Cambridge IGCSE 0653 Combined Sciences past paper questions on forces, across Theory, Multiple Choice and Alternative to Practical.
Theory
Forces — Extended1 · Paper 4
All Forces questions in this collection
| Type | Level | Paper | Session | Q# | Marks | Answer / key |
|---|---|---|---|---|---|---|
| Theory | Extended | Paper 41 | May/Jun 2023 | Q5 | 9 marks | C H |