Independent final check
Explain without the key
define / calculate / state / explain
Final check
define: give the precise meaning. calculate: work out the answer from the data. state: give a concise answer. explain: give reasons and connect them to evidence.
A rover has a mass of 180 kg. On Mars its weight is 670 N. (a) Define gravitational field strength. (b) Calculate the gravitational field strength on Mars, to 2 significant figures. (c) State the rover’s mass on Mars. (d) The rover’s weight on Earth is 1760 N. Explain, using the idea of a gravitational field, why it is different on Mars. (e) How could you check, on Mars, that a sample has the same mass as a 1 kg standard mass? (f) A tool slips from the rover’s arm. Mars has almost no air. What is the tool’s acceleration as it falls?
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Mass and weight, gravitational field strength g = W / m and comparing masses on a balance (1.3.1–1.3.5), density ρ = m / V, measuring the density of a liquid, a regular solid and an irregular solid that sinks, and predicting from density data whether an object floats or one liquid floats on another (1.4.1–1.4.4). Forces and their effects are in FORCE01; pressure in liquids is in PRES01.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus