Physics 1 — Motion & Energy
Kinematics, free fall, projectiles, Newton’s laws, friction, and energy conservation — all with units.
All of mechanics rests on four ideas: things move (kinematics), forces change that motion (Newton), and two bookkeeping tricks — energy and momentum — let you skip the messy middle and jump straight to the answer. Every quantity below carries real units, and the engine checks them for you: try adding metres to seconds and watch it refuse. Change any input and the whole chain recomputes.
- 01 Motion with constant acceleration ELI5: if your acceleration is steady, just two equations tell you everything: v = v₀ + a·t — how fast you end up d = v₀·t + ½·a·t² — how far you travel. The…
- 02 Free fall ELI5: drop anything and gravity pulls with a constant acceleration g ≈ 9.81 m/s² — so the same two equations apply, starting from v₀ = 0. A surprise: the fall…
- 03 Projectile motion ELI5: launch something at an angle and the motion splits into two independent stories: sideways, the speed never changes; up-and-down, it's pure free fall.…
- 04 Newton's second law & friction ELI5: F = m·a, but that F is the net force — everything pushing and pulling, added up. Shove a box and friction shoves back with f = μ·N, where N is how hard…
- 05 Energy conservation ELI5: lift a mass and you bank energy as potential, m·g·h; let it fall and the bank pays out as kinetic energy, ½·m·v². With no air resistance nothing leaks —…
next course: Physics 2 — Momentum & Waves →