Back to revision notes Open full-size SVG Print mind map Part A · Core ideas Forces and their effects mind map Use your browser’s Print command for A4 landscape, or choose A3 in its paper settings. The SVG remains sharp when enlarged. A text version follows the map.
Read the mind map as text Interactions Vector forces: Magnitude and direction, N; contact requires touchingNormal / friction: Support ⟂ surface; friction opposes relative slidingTension / fluid: String pulls; drag opposes relative motion; upthrust upwardThird law: Equal opposite forces on different objects; acceleration may differFields Non-contact: Region where suitable object experiences force; not a stringGravity: Masses attract; weight is gravitational forceElectrostatic: Like charges repel; unlike attractMagnetic: Like poles repel; unlike attract; not all metals magneticTest object: Field exists without it; force needs a suitable objectFree-body diagrams One object: Label force arrows; length shows size, arrow shows directionSupported book: Weight / normal balance on book; not a third-law pairBalanced: Zero resultant → no acceleration; constant-velocity carDirections: Equal perpendicular forces do not cancel; resolve angled tensionScale vectors Add accurately: Scalars lack direction; add / subtract collinear forcesDrawing: Scale lengths / angles; head-to-tail without rotating arrowsParallelogram: Common origin; diagonal gives resultant; measure directionBalance / resolve: Equilibrant opposes resultant; rectangle sides are componentsCheck: 3 N ⟂ 4 N → 5 N; equilibrium forms closed force polygonConnections Interactions → Free-body diagrams: Free-body diagrams include forces on one object only. Free-body diagrams → Scale vectors: Vector addition checks whether resultant force is zero. 