PHYSICS COURSE (AIEEE/PET/PMT-2014) SARASWATI EDUCATIONAL INSTITUTE 9826032282 FORCE CLASS SHEET-11 (Mobile: 9826032282 )

1. Find out the normal reaction in give figure

2. Find out the normal reaction in give figure

3. Find out the tension in string in give figure

T

4. Find out the tensionT1 and T2 in string in

give figure

5. Mass 20 kg and 30 kg are placed on smooth surface

and connected by string which is mass less and

inextensible

6. The time period of a simple pendulum measured inside

a stationary lift is found to be T. If the lift starts

accelerating upwards with an acceleration g/3, the time

period is

7. A monkey of mass 10kg is holding a vertical rope. The

rope will not break when a mass of 25 kg is suspended

from it but will break if the mass exceeds 25 kg. What

is the maximum acceleration with which the monkey

can climb up along the rope )/10( 2smg

8. A body of mass 5kg is suspended by a spring balance

on an inclined plane as shown in figure. The spring

balance measure

9. Two forces with equal magnitudes F act on a body and

the magnitude of the resultant force is F/2. The angle

between the two forces is

10. Three forces starts acting simultaneously on a particle

moving with velocity .v

These forces are represented

in magnitude and direction by the three sides of a

triangle ABC (as shown). The particle will now move

with velocity

(a) v remaining unchanged

(b) Less than v

(c) Greater than v

(d) v in the direction of the largest force BC

11. the blocks shown in the diagram that are being pushed

by a constant force on a frictionless tablethen net force

on 3kg is

12. In above question contact force between 2kg and 3kg

blocks

13. A block of mass M is pulled along a horizontal

frictionless surface by a rope of mass M/4. If a force P

is applied at the free end of the rope, the force exerted

by the rope on the block will be

14. A rope of length L is pulled by a constant force F.

What is the tension in the rope at a distance L/4 from

the end where the force is applied

15. Three blocks A, B and C weighing 1, 8 and 27 kg

respectively are connected as shown in the figure with

an inextensible string and are moving on a smooth

surface. 3T is equal to 72 N. Then 2T is

P-11

C

A B

M

30°

3 kg 2 kg

1 kg

F

A T1

B C

T2 T3

10kg

50 N

7kg

3 kg

T2

T1

5 kg

T T 20 kg

60 N 30 kg

20kg

2 N

16. A light string passes over a frictionless pulley. To one

of its ends a mass of 6 kg is attached. To its other end a

mass of 10 kg is attached. The tension in the thread will

be

17. A block A of mass 3 kg is placed on a frictionless

table. A thread tied to it passes over a frictionless

pulley and carries a body B of mass 7 kg at the other

end. The acceleration of the system is (given g = 10

)2ms

18. A body of weight 4kg is suspended as shown in the

figure. The tension 1T in the horizontal string (in kg wt)

is

19. A block of mass 4 kg is suspended through two light

spring balances A and B. Then A and B will read

respectively

20. The mass of a body measured by a physical balance in

a lift at rest is found to be m. If the lift is going up with

an acceleration a, its mass will be measured as

21. A string of negligible mass going over a clamped

pulley of mass m supports a block of mass M as shown

in the figure. The force on the pulley by the clamp is

given by

22. Two blocks are connected by a string as shown in the

diagram. The upper block is hung by another string. A

force F=60N applied on the upper string in the

upward direction. Then find T and T be the

tensions in the two parts of the string and acceleration

.

23. Find tension T

24. a monkey of mass 20 kg moving upwards with

velocity 2 m/s on string then tension in string is

25. Find out the tension in string which connected the mass 6kg to 4 kg .

10 kg 6 kg

A

B

4kg

B

A

4kg

m

m

30°

60 N

T

2 kg

4 kg

T'

3kg 5kg

T2

80N

600

T

6kg 3kg

2kg

4kg

30°

T1

2 kg