Contents
Return after a break
What can you recall?
define / calculate / state
Recall and explain
A railway truck rolls at 2.4 m/s. Its momentum is 7200 kg m/s. (a) Define momentum. (b) Calculate the mass of the truck. (c) The truck hits a second truck of mass 1800 kg at rest, and they couple together. Calculate the velocity of the coupled trucks. (d) State the condition for the total momentum to stay the same in the collision.
define: give the precise meaning. calculate: work out the answer from the data. state: give a concise answer.
Your saved work
Answers, earlier attempts and your Pause and check notes 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.
Supplement throughout: momentum as mass × velocity, p = mv (1.6.1); impulse as force × the time for which it acts, impulse = FΔt = Δ(mv) (1.6.2); the principle of the conservation of momentum for simple problems in one dimension, including explosions from rest (1.6.3); resultant force as the change in momentum per unit time, F = Δp/Δt (1.6.4), with crumple zones, airbags and seat belts. Kinetic energy and sorting collisions by energy are not used (kinetic energy is in Energy); collisions in two dimensions, Newton’s third law by name and rockets beyond a one-line example are left out. Velocity and acceleration are in Speed and motion graphs, F = ma in Resultant force.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus