A force F is applied to a block of mass m at an angle a to the horizontal. If the block is stationary,

frictional force is equal to F cos a.

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frictional force is equal to F sin a.

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frictional force is equal to mg – F sin a.

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frictional force is equal to mg + F sin a.

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Solution

The correct option is A frictional force is equal to F cos a.

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