Contents
Part 2 of 2
Impulse and safety
define
Try it yourself
Which of these is the definition of impulse?
define: give the precise meaning.
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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