Home › A-Level 9702 › Physical quantities and units
AS · Topic 1

The language of physics.

SI base units and prefixes, the homogeneity that every equation must obey, the difference between accuracy and precision, and the scalar versus vector distinction that runs through the whole course. The chapter every student is tempted to skip and later regrets. Play the three simulations below; the gamified lessons, the topic Paper 1 practice, and the concept map are all live below too.

Simulations · live
Interactive · live Dimensional balance Build an equation from base units and watch the scales tip until both sides share the same dimensions and balance. Loads only when you launch, so the page stays fast.
Interactive · live Accuracy and precision Scatter shots at a target and see how systematic and random error separate the two ideas of accuracy and precision. Loads only when you launch, so the page stays fast.
Interactive · live Adding and resolving vectors Drag two vectors tip-to-tail to find the resultant, then resolve it into perpendicular components with sine and cosine. Loads only when you launch, so the page stays fast.
Paper 1 practice · live
Multiple-choice · Paper 1 style Paper 1 multiple-choice questions A full topic set across units and prefixes, homogeneity, uncertainties and vectors, in the multiple-choice Paper 1 style. Open practice →
Lessons · live
Physical quantities, SI units and prefixes → Errors and uncertainties → Scalars and vectors →
Concept map
Open the concept map →