Part 2 of 2

Falling and drag

identify / explain

Try it yourself

identify: name or select. explain: give reasons and connect them to evidence.

Drag acts on an object that moves through a liquid or a gas. Choose every case in which drag acts on the moving object, then explain what those cases have in common.

Choose all statements you think are correcta.A submarine moving through the seab.A cyclist riding along a roadc.A steel ball sinking through oild.A space probe drifting through empty space, far from any planete.A stone falling in a tube with all the air pumped out

What do the cases with drag have in common?

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Scope and sources

Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

The acceleration of free fall g, approximately constant near the Earth and about 9.8 m/s² (1.2.8); acceleration as the change in velocity per unit time, a = Δv ÷ Δt (1.2.9); constant and changing acceleration from data and from a speed–time graph (1.2.10); acceleration from the gradient of a speed–time graph (1.2.11); deceleration as a negative acceleration (1.2.12); falling in a uniform gravitational field with and without air or liquid resistance, and terminal velocity (1.2.13); friction between solid surfaces, which impedes motion and causes heating (1.5.1.6); drag in liquids and air resistance in gases (1.5.1.7, 1.5.1.8). Resultant force, F = ma and Newton’s first law are in FORCE01.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus