Physics

Gist: Every physics concept in the vault, and the lecture it came from.

Sources: content/sources/physics/. The handwritten PDF is ground truth; everything below is a derived index.

Lectures

• Lecture 02 — 1D kinematics — velocity and acceleration from averages to derivatives, free fall, and how each is measured.

Concepts

• Average acceleration — change in velocity over the time it took.
• Average speed — distance over time, unsigned.
• Average velocity — displacement over time, signed.
• Free fall — everything falls at $g=9.8$ m/s², whatever its mass or shape.
• Instantaneous acceleration — $dv/dt$, the second derivative of position.
• Instantaneous speed — the unsigned value of instantaneous velocity.
• Instantaneous velocity — $dx/dt$, the tangent slope on a position-time graph.
• Kinematic equations — constant acceleration makes position a quadratic in $t$.
• Measurement resolution — what you want to measure sets the instrument you need.
• Measuring g by free fall — drop from a known height, time it, solve for $g$.
• Position-time graph — the whole motion as a single curve.
• Sign convention — which way counts as $+x$ is a choice, not a fact.
• Stroboscopic measurement — a known flash rate turns spacing into speed.