What is it
Projectile motion analyses an object launched into the air under gravity alone, by treating the horizontal and vertical components of motion completely independently — horizontal motion at constant velocity, vertical motion under constant acceleration.
Why it matters
Projectile motion is the classic application that ties together kinematics, vectors and trigonometry into one coherent real-world problem — understanding it deeply makes every other 2D mechanics topic more intuitive.
Exam tip
Always split the initial velocity into horizontal and vertical components using trigonometry before doing anything else — attempting to work with the resultant velocity directly, rather than its components, is the most common projectile motion mistake.
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