Physics
Physics guides,
with the units kept.
Physics marks disappear in three places: the formula chosen, the units, and the sign. Every guide here keeps all three visible from the first line to the last.
Guides
How to Calculate Force
Newton's second law, what counts as the net force, and how to get acceleration when a question only gives you a velocity change. Three worked examples and practice.
Speed vs Velocity
Speed is a scalar built on distance; velocity is a vector built on displacement. Why a completed lap has zero velocity, with worked examples and practice.
What this covers
- Newton's second law and net force
- Scalars and vectors, and why the distinction is examined
- Sense-checking whether an answer is physically plausible
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