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 $$\theta$$ 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 $$60^\circ$$ and $$30^\circ$$ with the horizontal.

Then:

 (A) $${T}_1=25~ \text{N}$$ (B) $${T}_2=25 ~\text{N}$$ (C) $${T}_1=25 \sqrt{3}~ \text{N}$$ (D) $${T}_2=25 \sqrt{3}~ \text{N}$$
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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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 $$\overrightarrow N+\overrightarrow T+\overrightarrow W=0$$ 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. $$20g$$
2. $$45g$$
3. $$40g$$
4. $$60g$$

Subtopic:  Tension & Normal Reaction |
62%
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. $$\sqrt{2} M g$$
2. $$\sqrt{2} m g$$
3. $$\sqrt{\left( M + m \right)^{2} + m^{2}} g$$
4. $$\sqrt{\left(M + m \right)^{2} + M^{2}} g$$

Subtopic:  Tension & Normal Reaction |
53%
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 $$500$$ grams 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 |
82%
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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