Return after a break
What can you recall?
state / calculate / describe
Recall and explain
state: give a concise answer. calculate: work out the answer from the data. describe: give the features or what happens.
Keep the lesson closed. (a) State what is meant by acceleration, and give its unit. (b) A runner's speed–time graph is a straight line from 3.0 m/s at 0 s to 7.0 m/s at 2.0 s. Use its gradient to calculate her acceleration. (c) On a speed–time graph, what does each of these show: a straight rising line; a rising curve that gets flatter; a flat line; a straight falling line? (d) A lorry slows from 25 m/s to 10 m/s in 5.0 s. Calculate its acceleration and state its deceleration. (e) Name the force between brake pads and a brake disc, and say what it does to the disc. (f) State the acceleration of free fall near the Earth, and say how the speed of a falling stone changes in each second when the air hardly slows it.
Your saved work
Answers and earlier attempts stay in this browser. Export a copy to keep, to move to another device or to hand to your teacher. Importing a copy keeps your current answers and adds earlier attempts.
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