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Yekeen NEET 2.0 (2026)

Physics by Saleem Sir
KPP - 22 Newton’s Laws of Motion
Time Limit 01 Hour
1. The breaking strength of the string connecting wall 5. A 50-kg homogeneous smooth sphere rests on the 30°
and block B is 175 N, Find the magnitude of weight incline A and bears against the smooth vertical wall
of block A for which the system will be stationary. B. Calculate the contact forces at A and B.
Block B weighs 700 N.

6. A ball of mass m kept at the corner as shown in the

2. An iron ball of mass m = 50 g falls from a height of figure, is acted by a horizontal force F. The correct
free body diagram of ball is:
h1 = 5 m and rises upto h2 = 3.2 m after colliding with
the horizontal surface. If the time of contact of the
glass half is t = 0.02 s, find the average contact force
exerted on the ball by the horizontal surface.

3. A cylinder of weight W is resting on two inclined

planes forming a V-groove as shown in figure. Ignore
friction everywhere.
(a) Draw its free body diagram of the sphere. (1)
(b) Calculate normal reactions between the cylinder
and two inclined walls.

(2)

4. A block of mass 30 kg is suspended by three strings

as shown in figure. Find the tension in each string. (3)

(4)
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7. In a given figure system is in equilibrium. If 10. In arrangement shown the block A of mass 15 kg is
W1 = 300 N. Then W2 is approximately equal to: supported in equilibrium by the block B. Mass of the
block B is closest to

(1) 500 N (2) 400 N

(3) 670 N (4) 300 N

8. A girl pushes her physics book up against the

horizontal ceiling of her room as shown in the figure. (1) 2 kg
The book weighs 20 N and she pushes upwards with (2) 3 kg
a force of 25 N. The choices below list the magnitudes (3) 4 kg
of the contact force FCB between the ceiling and the
(4) 5 kg
book, and FBH between the book and her hand. Select
the correct pair. 11. As shown in the figure, two equal masses each of
2 kg are suspended from a spring balance. The
reading of the spring balance will be:

(1) FCB = 20 N and FBH = 25 N

(2) FCB = 25 N and FBH = 45 N
(3) FCB = 5 N and FBH = 25 N (1) Zero
(2) 2 kg
(4) FCB = 5 N and FBH = 45 N (3) 4 kg
(4) Between zero and 2 kg
9. The pulleys and strings shown in the figure are
12. A block of mass 4 kg is suspended through two light
smooth and of negligible mass. For the system to spring balances A and B. Then A and B will read
remain in equilibrium, the angle  should be: respectively.
[JEE (Scr) 2001]

(1) 0° (2) 30° (1) 4 kg and zero kg (2) Zerokg and 4 kg

(3) 45° (4) 60° (3) 4 kg and 4 kg (4) 2 kg and 2 kg
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13. A block of mass 3 kg is balanced by pulling force F. Multiple Choice Questions:

Magnitude of this pulling force F is: 16. A carpenter of mass 50 kg is standing on a weighing
machine placed in a lift of mass 20 kg. A light string
is attached to the lift. The string passes over a smooth
pulley and the other end is held by the carpenter as
shown. When carpenter keeps the lift moving upward
with constant velocity: (g = 10 m/s2).

(1) 20 N (2) 90 N
(3) 10 N (4) 15 N

14. Variation of force F acting on a body with time t is as

shown in figure. Change in momentum of the body in
the interval 4 s to 8 s is:

(1) the reading of weighing machine is 15 kg

(1) 10 kgms–1
(2) the man applies a force of 350 N on the string
(2) 5 kgms–1
(3) 100 kgms–1 (3) net force on the man is 150 N
(4) 20 kgms–1 (4) Net force on the weighing machine is 150 N

15. Two bodies of mass 4 kg and 6 kg are attached to the 17. A block of mass m is suspended from a fixed support
ends of a string passing over a pulley (see figure). The with the help of a cord. Another identical cord is
attached to the bottom of the block. Which of the
4 kg mass is attached to the table top by another following statement is /are true?
string. The tension in this string T1 is equal to:
(take g = 10 m/s2).

(1) If the lower cord is pulled suddenly, only the

upper cord will break.
(2) If the lower cord is pulled suddenly, only the
lower cord will break.
(1) 20 N
(3) If pull on the lower cord is increased gradually,
(2) 25 N
only the lower cord will break.
(3) 10.6 N (4) If pull on the lower cord is increased gradually,
(4) 10 N only the upper cord will break.
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Answer Key
175 8. (3)
1. WA = N
3 9. (3)
2. (45 N) 10. (2)
3. N=W 11. (2)
4. (TB = 500 N, TA = 400 N) 12. (3)
500 1000 13. (3)
5. N1 = N, N2 = N 14. (4)
3 3
15. (1)
6. (2)
16. (1, 2)
7. (4)
17. (2, 4)

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