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1 st Year : Unit 3.5( Laws of Motion ) - Block on Block

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In the figure shown, a block of weight 10 N resting on a horizontal surface. The coefficient of static friction between the block and the surface μ_s = 0.4 . A force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block, then the block will

A. Move over the surface with constant velocity

B. Move having accelerated motion over the surface

C. Not move

D. First it will move with a constant velocity for some time and then will have accelerated motion

E. None of the above

View Answer

Correct choice: C

Explanation:

F₁ μ₃ R = 0.4 × mg=0.4×10 i.e. minimum 4N force is required to start the motion of a body. But applied force is only 3N. So the block will not move.

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Eamcet Physics 1 st Year : Unit 3.5( Laws of Motion ) - Block on Block

Eamcet Physics
1 st Year : Unit 3.5( Laws of Motion ) - Block on Block