Laws Of Motion Question 352
Question: In the shown, a block of weight 10 N resting on a horizontal surface. The coefficient of static friction between the block and the surface $ {{\mu } _{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 [MP PET 1993]
Options:
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
Show Answer
Answer:
Correct Answer: C
Solution:
$ F _{l}={{\mu } _{s}}R=0.4\times mg=0.4\times 10=4N $ 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.
