Laws Of Motion JEE PYQs 2021
1. A particle is projected with velocity Vo along x-axis. A damping force is acting on the particle which is proportional to the square of the distance from the origin i.e, ma = -ax².The distance at which the particle stops :
2. The coefficient of static friction between a wooden block of mass 0.5 kg and a vertical rough wall is 0.2. The magnitude of horizontal force that should be applied on the block to keep it adhere to the wall will be [g = 10 ms-²] ____N.
Ans. F=25N
3. An inclined plane is bent in such a way that the vertical cross-section is given by y= x²/4y is in vertical and x in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction µ = 0.5, the maximum height in cm at which a stationary block will not slip downward is
____cm.
Ans. H=25cm
4. Two masses A and B, each of mass M are fixed together by a massless spring. A force acts on the mass B as shown in figure. If the mass A starts moving away from mass B with acceleration 'a', then the acceleration of mass B wil be :
(a) Ma-F/M (b) MF/F+Ma
(c)F+Ma/M (d) F-Ma/M
Ans.(d)
5. A particle is moving with uniform speed along the circumference of a circle of radius R under the action of a central fictitious force F which is inversely proportional to R³. Its time period of revolution will be given by :
