An object starts sliding down from point R of a rough semicircular surface, as shown in the figure. At which of the following points will the friction reverse its direction for the first time?

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Bewteen Q and R

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Solution

The correct option is A P
During the motion from R to P, direction of friction will be opposite to the direction of motion.
At P, the direction of motion reverses from upwards to downwards. So, the direction of friction will also reverse at P.

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An object starts sliding down from point R of a rough semicircular surface, as shown in the figure. At which of the following points will the friction reverse its direction for the first time?

The correct option is A PDuring the motion from R to P, direction of friction will be opposite to the direction of motion. At P, the direction of motion reverses from upwards to downwards. So, the direction of friction will also reverse at P.

The correct option is A P
During the motion from R to P, direction of friction will be opposite to the direction of motion.
At P, the direction of motion reverses from upwards to downwards. So, the direction of friction will also reverse at P.