2.2 — Instantaneous velocity and speed
Average velocity (§2.1) is a good summary of “how fast, overall” — but if your speed changes along the way, that number hides the details. A driver…
2.1 — Position, displacement, average velocity
Before we talk about “how fast” or “how much acceleration”, we must be able to say exactly “where”. This section defines the three foundations of all…
Chapter 2 — Motion Along a Straight Line
Master 1D motion: position, displacement, instantaneous velocity, constant acceleration, and free fall — kinematic equations with step-by-step solutions.
Q&A — Frequently asked questions for Chapter 1
Here are questions that often come up while learning this chapter — with short, clear answers. If you have a question that’s not listed, tell us and…
Further reading and references
Finished Chapter 1 and want to go deeper — or stuck somewhere and need a second source? This is our curated list. Each entry has a short note on why…
Practice problems — 22 exercises for tool mastery
§1.10 walked through six fully-solved problems that combined the tools from §1.6–§1.9. This section flips the script — 22 problems for you to solve…
Worked problems — Chapter 1 toolkit in action
Sections §1.6–§1.9 gave you four tools: scientific notation, dimensional analysis, significant figures, and factor-label conversion. Here are six…
Unit conversion — the factor-label method
In §1.7 we saw that any unit can be written as a fraction equal to one, and chain-multiplying those fractions cancels unwanted units. That was just…
Significant figures, precision, and accuracy
Every number in physics carries a hidden claim about how uncertain it is. When we write 4.53 m, we are implicitly saying that we’re confident of the…
Dimensional analysis
Behind every physics equation lies a hidden claim of the same rank: both sides describe the same kind of quantity. If one side has the dimensions of…