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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%

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A body of mass \(5\) kg is suspended by the strings making angles $\mathrm{}$\(60^\circ\)

Then:

(A) | \( {T}_1=25~ \text{N} \) |

(B) | \( {T}_2=25 ~\text{N} \) |

(C) | \({T}_1=25 \sqrt{3}~ \text{N} \) |

(D) | \({T}_2=25 \sqrt{3}~ \text{N} \) |

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?

$\mathrm{}$

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%

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%

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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%

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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/s^{2}. 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%

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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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