A disc is in pure translation and has a velocity of 3 m/s. It comes in to contact with a surface which has friction. What is the direction of the friction when it touches the ground

The direction of friction is opposite to translational velocity

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The direction of friction is along the direction of translational velocity

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Friction arises only when the object starts rolling

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None of the above

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Solution

The correct option is A The direction of friction is opposite to translational velocity
When the object just touches the rough surface, it is still in the state of sliding friction and hence the object initially slides. The sliding continues until the no-slip condition is achieved. During sliding motion, the direction of friction is just opposite to direction of translational motion.

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