Physics explained: every letsBug physics post

Forces, motion and GPS explained with real numbers, from rockets to running tracks. Each post goes with a letsBug video and ends with practice questions.

1. 10 Newton's second law examples in everyday life (F = ma): 10 Newton's second law examples in everyday life, from trolleys and lifts to cricket catches and rockets, each worked out with F = ma and numbers.
2. How Do Rockets Work in Space With No Air? Newton's Third Law: Rockets push their own exhaust gas, and the gas pushes back. Newton's third law explained with a real Falcon 9 example, plus the classic mix-up.
3. Distance vs displacement: how can displacement be zero?: Distance vs displacement, speed vs velocity: why a 400 m lap has zero displacement, with worked examples, m/s conversions and exam questions.
4. How Does GPS Work Without Internet? It's All About Time: How GPS works without internet: your phone just listens to satellite clocks. How to use it offline, why 4 satellites, and why it needs Einstein.

More subjects: Maths · Chemistry · Biology · Geography · Code · Builds · Devlog. And how we check facts.