Q.
In figure a block of weight 10 N is shown resting on a horizontal surface. The coefficient of static friction between the block and surface is $\mu_{s} = 0.4.$ A force of 3.5 N will keep the block in uniform motion, once it has been in motion. A horizontal force of 3 N is applied to the block. The block will there
A) Move over the surface with a constant velocity
B) Moves having accelerated motion over the surface
C) Not move
D) First move with a constant velocity for sometime and then will have accelerated motion
Explanation
(c) $f_{ms} = 0.4t \times 10$N =4 N
The applied force is less than $f_{ms}$. So, the block would not move
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.