The scalar that makes electrostatics easy: potential and potential energy, E = −dV/dr, equipotentials, the electron-volt, and Gauss's law applied to a sheet, a conductor and a shell with its graphs.
Unit 5 carries 4 of the 50 physics marks; with three chapters sharing them, this one averages a little over one (MEC publishes weights by unit, not by chapter). It is the hardest of the three and the most rewarding, because everything in the capacitor chapter is built from it, and because most of its questions are decided by a single habit: knowing at every moment whether the quantity in front of you is a vector that falls as 1/r² or a scalar that falls as 1/r.
The MEC scope lines are: Concepts, calculations and graphical analysis; Gauss's law and applications. The two headings below are those points, in MEC's order.
Three ways it comes:
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See the plansPhysics Formula Sheet — Rapid Revision
Every Physics relation on the MECEE-BL blueprint on one page: mechanics, heat, waves and optics, electricity and magnetism, modern physics — with the constants and unit traps that cost marks.
Physical Quantities, Vectors and Scalars: Units, Errors, Resultants
SI units and prefixes, precision against accuracy, significant-figure arithmetic, error combination, the dimensional formulae that get asked, and every vector law from the parallelogram to the river crossing.
Kinematics: Motion Graphs, Free Fall and the Projectile
The three equations of motion, what every slope and area on a motion graph means, free-fall and relative-motion numericals, the full projectile set, and what air resistance does to all of it.
Dynamics: Newton's Laws, Momentum, Energy, Collisions, Friction
Free-body reasoning from Newton's three laws, the equilibrium conditions and Lami's theorem, impulse and momentum conservation, work-energy and power, the collision formulae, and every friction case the paper sets.