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A block of mass 2kg placed on rough horizontal surface and an external force applied on block as shown in following situations .The coefficient of friction between the block and the surface in each situation is 0.4. Then choose correct option(s)

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Force of friction is zero in Fig. (i) and Fig. (iii)

Force of friction is 2.5 N in Fig. (ii) and Fig. (iv)

Acceleration of the block is zero in all situations

Normal force is not equal to 2g in Fig. (iii) and Fig. (iv)

answer is A, B, C, D.

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Detailed Solution

i) Force of friction is zero in (a) and (c) because block has no tendency to move.

ii) Force of friction is 2.5 N in (b) and (d) because applied for in horizontal direction in both is 2.5 N.

iii) Acceleration is zero in all cases.

iv) Normal force is not equal to 2g ub (c) and (d) because some extra vertical force is also acting

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