Mistake Master
Mistake Master · AP Physics 1 · Unit 6 · Step-Through Animation
Momentum, for Things That Spin
You'll learnthat angular impulse — the area under torque-vs-time — changes angular momentum.
A steady torque leans on a wheel for four seconds. What it deposits isn’t energy — it’s angular momentum, and the receipt is the area under a graph. Just mind which graph.
SPIN LAB
Before you start
What you're looking at
A string pulling a wheel with a steady 2 N·m torque for four seconds, next to a pink momentum ledger.
The question
What does the steady torque deposit over four seconds, and how fast does the wheel then spin?
Watch for
The pink L bar filling as area accumulates under the torque-versus-time graph.
What the symbols mean
Pink = the angular-momentum ledger (kg·m²/s); the graph's horizontal axis is time, its area is angular impulse.
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