Work and power in rotating systems (AQA A-Level Physics): Quizzes

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Work and power in rotating systems
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What is the equation for work done by a constant torque in a rotating system?

W=TθW = T\theta

In the equation W=TθW = T\theta, what unit must angular displacement θ\theta be measured in?

Radians

Which linear motion equation is W=TθW = T\theta the rotational equivalent of?

W=FsW = Fs

What does resistive frictional torque do to a rotating system?

Opposes rotation and reduces KE

What is the equation for power in a rotating system?

P=TωP = T\omega

What does angular velocity ω\omega represent?

Rate of change of angular displacement

The equation P=TωP = T\omega is the rotational equivalent of which linear power equation?

P=FvP = Fv

Calculate power needed to maintain 15 rad⋅s−115\text{ rad}\cdot\text{s}^{-1} against frictional torque of 25 Nm25\text{ Nm}.

375 W375\text{ W}

A 200 N200\text{ N} force acts on a disc edge (radius 0.10 m0.10\text{ m}). Find the torque produced.

20 Nm20\text{ Nm}

When a torque causes an object to rotate through an angle, what always happens?

Work is done

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