Fundamentally, the normal force between two surfaces in contact is:

1. Electromagnetic

2. Gravitational

3. Weak nuclear force

4. Strong nuclear force

Subtopic:  Types of Forces |
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The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle θθ should be: 
 
1. 00
2. 3030
3. 4545
4. 6060

Subtopic:  Tension & Normal Reaction |
 84%
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A body of mass 55 kg is suspended by the strings making angles 6060 and 3030 with the horizontal.

 
Then:

(A) T1=25 NT1=25 N
(B) T2=25 NT2=25 N
(C) T1=253 NT1=253 N
(D) T2=253 NT2=253 N
Choose the correct option from the given ones:
1. (A), (B), and (C) only
2. (A) and (B) only
3. (A) and (D) only
4. (A), (B), (C), (D)
Subtopic:  Tension & Normal Reaction |
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In the shown system, each of the blocks is at rest. The value of θθ is:
 
1. tan1(1)tan1(1)
2. tan1(34)tan1(34)
3. tan1(43)tan1(43)
4. tan1(35)tan1(35)

Subtopic:  Tension & Normal Reaction |
 70%
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Three blocks with masses of mm, 2m2m, and 3m3m are connected by strings as shown in the figure. After an upward force FF is applied on block mm, the masses move upward at a constant speed, vv. What is the net force on the block of mass 2m2m? (gg is the acceleration due to gravity). 

      
1. 2mg2mg 2. 3mg3mg
3. 6mg6mg 4. zero
Subtopic:  Tension & Normal Reaction |
 74%
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A mass MM of 100 kg100 kg is suspended with the use of strings AA, BB and CC as shown in the figure. The tension in the string BB will be:
           
1. 100g N100g N 2. zero
3. 1002g N1002g N 4. 1002g N1002g N
Subtopic:  Tension & Normal Reaction |
 67%
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A metal sphere is suspended from a wall by a string. The forces acting on the sphere are shown in the figure. Which of the following statements is NOT correct?
   

1.

N+T+W=0N+T+W=0

2. T2=N2+W2T2=N2+W2
3. T=N+WT=N+W 4. N=WtanθN=Wtanθ
Subtopic:  Tension & Normal Reaction |
 63%
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A man of mass 6060 kg is standing on the ground and holding a string passing over a system of ideal pulleys. A mass of 1010 kg is hanging over a light pulley such that the system is in equilibrium. The force exerted by the ground on the man is: (g=g= acceleration due to gravity)

             

1. 20g20g
2. 45g45g
3. 40g40g
4. 60g60g

Subtopic:  Tension & Normal Reaction |
 63%
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A string of negligible mass going over a clamped pulley of mass mm supports a block of mass MM as shown in the figure. The force on the pulley by the clamp is given by:
 
1. 2Mg2Mg
2. 2mg2mg
3. g(M+m)2+m2g(M+m)2+m2
4. g(M+m)2+M2g(M+m)2+M2

Subtopic:  Tension & Normal Reaction |
 54%
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What is the minimum value of force FF such that at least one block leaves the ground in the given figure? (g=10 m/s2)(g=10 m/s2)

 

1. 20 N,2 kg20 N,2 kg leaves the ground first.
2. 30 N,3 kg30 N,3 kg leaves the ground first.
3. 40 N,2 kg40 N,2 kg leaves the ground first.
4. 50 N,3 kg50 N,3 kg leaves the ground first.
Subtopic:  Tension & Normal Reaction |
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