FREE LEARNING SERIES
Physics: measurement, motion and energy
Use units, draw motion graphs and connect forces to changes in energy.
4 lessons · Learn at your own pace
Begin the first lesson →
Learn, practise, explain
Try the exercise before reading its explanation. Answer the self-check questions in your own words, then compare your reasoning with the answers. Revisit any difficult section before moving on. No account or payment is needed.
- 01
Units, measurement and uncertainty: what a number can tell you
A measured bench length and a calculator result are not equally certain. Learn to connect numbers with units, instrument limits and a clearly described method before using them in a calculation.
Learning outcome: Read instruments thoughtfully, convert units, distinguish random variation from a systematic offset, and report a calculated quantity without overstating its precision.
Open lesson → - 02
Speed, velocity and acceleration: describe a journey precisely
A student can walk a long route and finish near the starting point. Separate path length, change of position and change of velocity, then connect each quantity to a graph.
Learning outcome: Calculate journey averages, interpret position–time and velocity–time graphs, and solve constant-acceleration problems while checking when their assumptions apply.
Open lesson → - 03
Forces, Newton’s laws and friction: explain changes in motion
A trolley can move with balanced forces or stay still while someone pushes it. Resolve this puzzle by drawing forces on one object and distinguishing motion from change in motion.
Learning outcome: Use force diagrams, distinguish action–reaction pairs from balanced forces, and calculate acceleration and average stopping force under stated assumptions.
Open lesson → - 04
Work, energy and power: follow transfers and rates
Lifting the same box slowly or quickly changes the required average power, while the ideal energy transfer can stay the same. Learn to choose the system and track what crosses its boundary.
Learning outcome: Calculate signed work, kinetic and gravitational potential energy, distinguish energy from power, and test whether a mechanical-energy shortcut is justified.
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