First slide

The two types of acceleration

Question

A circular disc is rotating with a varying speed u =(2t-4) m/s, where t is in second. An object is placed in the disc. The pseudo fore on the object is

Moderate

A

is maximum at t = 2 sec.
B

is minimum at t = 2 sec
C

is zero at t = 2 sec
D

None of the above

Solution

Total acceleration of the disc $\sqrt{a_{T}^{2} + a_{R}^{2}}$ and pseudo force depends on net acceleration.
$\begin{array}{l} a_{T} = 2 m / s^{2} a_{R} = u^{2} / R at t = 2 \sec \\ u = 0 \\ a_{R} = 0 \end{array}$

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