Mistake Master
Mistake Master · AP Physics 1 · Unit 6 · Step-Through Animation
Work, Cranked Through an Angle
You'll learnthat a torque turning through an angle does work on a rotating body.
A torque that turns a wheel through an angle deposits energy — the same W = F·d you already own, wearing its rotational costume. One crank, one brake, and the graph trap that eats points every May.
SPIN LAB
Before you start
What you're looking at
A hand cranking a wheel with a steady 2 N·m torque, beside a torque graph and readouts.
The question
How much energy does the crank deposit, and how fast does the wheel end up spinning?
Watch for
The shaded area building under the torque-versus-angle graph as the wheel turns.
What the symbols mean
The graph's horizontal axis is angular displacement; the area under the torque line is work, in joules.
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