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Physics - Rotation Question with Solution | TestHub

PhysicsRotationMiscellaneousMedium3 minCT47

PhysicsMediummultiple choice

A disc is kept on a perfect rough surface at rest and now two forces of equal magnitude are applied in opposite direction as shown in the figure. Mark the CORRECT statement(s) :-

CT47 diagram

Options:(select one or more)

Answer:

B, D

Solution:

$ma = f$ .

$I α = FR - f R$ .

For pure rolling, $a = α R$ , and $I = \frac{1}{2} m R^{2}$ .

Thus $\frac{1}{2} ma = F - f$ . With $f = ma$ , $\frac{3}{2} ma = F$ .

So $a = \frac{2 F}{3 m}$ and $f = \frac{2 F}{3}$ , both toward $+ x$ .

A and C are false; B and D are true.

Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous

⏱ 3mℹ️ Source: CT47

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