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 |
84%
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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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In the shown system, each of the blocks is at rest. The value of $$\theta$$ is:

1. $$\tan^{- 1} \left(1\right)$$
2. $$\tan^{- 1} \left(\frac{3}{4}\right)$$
3. $$\tan^{- 1} \left(\frac{4}{3}\right)$$
4. $$\tan^{- 1} \left(\frac{3}{5}\right)$$

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

 1 $$2mg$$ 2 $$3mg$$ 3 $$6mg$$ 4 zero
Subtopic:  Tension & Normal Reaction |
73%
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A mass $$M$$ of $$100~\text{kg}$$ is suspended with the use of strings $$A$$, $$B$$ and $$C$$ as shown in the figure. The tension in the string $$B$$ will be:

 1 $$100 g~\text{N}$$ 2 zero 3 $$100\sqrt{2}g~\text{N}$$ 4 $$\frac{100}{\sqrt{2}}g~\text{N}$$
Subtopic:  Tension & Normal Reaction |
66%
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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%
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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%
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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. $$g\sqrt{\left( M + m \right)^{2} + m^{2}}$$
4. $$g\sqrt{\left(M + m \right)^{2} + M^{2}}$$

Subtopic:  Tension & Normal Reaction |
53%
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What is the minimum value of force $$F$$ such that at least one block leaves the ground in the given figure? $$\left(g=10~\text{m/s}^2\right)$$ $\mathrm{}$

 1 $$20~\text{N}, 2~\text{kg}$$ leaves the ground first. 2 $$30~\text{N}, 3~\text{kg}$$ leaves the ground first. 3 $$40~\text{N}, 2~\text{kg}$$ leaves the ground first. 4 $$50~\text{N}, 3~\text{kg}$$ leaves the ground first.
Subtopic:  Tension & Normal Reaction |
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