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 |
From NCERT
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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 \(\theta\) should be: 
     
1. \(0^\circ\)
2. \(30^\circ\)
3. \(45^\circ\)
4. \(60^\circ\)

Subtopic:  Tension & Normal Reaction |
 83%
From NCERT
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A body of mass \(5\) kg is suspended by the strings making angles 60°and 30°with the horizontal.


Then:

a. T1=25 N                    
b. T2=25 N
c. T1=253 N               
d. T2=253 N
Choose the correct option:

1. (a),(b) 2. (a),(d)
3. (c),(d) 4. (b),(c)
Subtopic:  Tension & Normal Reaction |
 76%
From NCERT
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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.

\(\vec N+\vec T+\vec W=0\)

2.  \(T^2=N^2+W^2\)
3.   \(T = N + W\) 4. \(N = W tan \theta\)
Subtopic:  Tension & Normal Reaction |
 63%
From NCERT
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A man of mass \(60\) kg is standing on the ground and holding a string passing over a system of ideal pulleys. A mass of \(10\) kg is hanging over a light pulley such that the system is in equilibrium. The force exerted by the ground on the man is: (\(g=\) acceleration due to gravity)

         

1. \(20\) g
2. \(45\) g
3. \(40\) g
4. \(60\) g

Subtopic:  Tension & Normal Reaction |
 61%
From NCERT
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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:
                 

1. 2Mg

2. 2mg

3. (M+m)2+m2g

4.(M+m)2+M2g

Subtopic:  Tension & Normal Reaction |
 52%
From NCERT
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Choose the incorrect alternative:

1. Newton's first law is the law of inertia.
2. Newton's first law states that if the net force on a system is zero, the acceleration of any particle of the system is not zero.
3. Action and reaction act simultaneously.
4. The area under the force-time graph is equal to the change in momentum.
Subtopic:  Newton's Laws |
 85%
From NCERT
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The force \(\mathrm{F}\) acting on a particle of mass \(\mathrm{m}\) is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from \(0\) to \(8\) s is:
        

1. \(24\) N-s 2. \(20\) N-s
3. \(12\) N-s 4. \(6\) N-s
Subtopic:  Newton's Laws |
 83%
From NCERT
AIPMT - 2014
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On the application of an impulsive force, a sphere of mass \(500\) g starts moving with an acceleration of \(10\) m/s2. The force acts on it for \(0.5\) s. The gain in the momentum of the sphere will be:

1. \(2.5\) kg-m/s

2. \(5\) kg-m/s

3. \(0.05\) kg-m/s

4. \(25\) kg-m/s

Subtopic:  Newton's Laws |
 81%
From NCERT
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A rigid ball of mass \(M\) strikes a rigid wall at \(60^{\circ}\) and gets reflected without loss of speed, as shown in the figure. The value of the impulse imparted by the wall on the ball will be:
         

1. \(Mv\) 2. \(2Mv\)
3. \(\frac{Mv}{2}\) 4. \(\frac{Mv}{3}\)
Subtopic:  Newton's Laws |
 75%
From NCERT
NEET - 2016
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