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A Coin Placed on a Rotating Turntable Just Slips. If It is Placed at a Distance of 4 Cm from the Centre. - Physics

ConceptCircular Motion

Question

A coin placed on a rotating turntable just slips. If it is placed at a distance of 4 cm from the centre. If the angular velocity of the turntable is doubled, it will just slip at a distance of

• 1 cm

• 2 cm

• 4 cm

•  8 cm

8 cm

Solution 2

1 cm

Let the force of friction between the coin and the rotating turntable be F.
For the coin to just slip ,

we have : $\text{ F = m }\omega^2 \text{r}$

Here, $\text{ m } \omega^2 \text{ r}$ is the centrifugal force acting on the coin.

For constant F and m, we have : $\text{r} \propto \frac{1}{\omega^2}$

Therefore,

$\frac{\text{r}'}{\text{r}} = \left( \frac{\omega}{\omega'} \right)^2$

$\Rightarrow \text{ r' = 1 cm }$

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Solution A Coin Placed on a Rotating Turntable Just Slips. If It is Placed at a Distance of 4 Cm from the Centre. Concept: Circular Motion.
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