List of top Physics Questions on Forces

A force, \( \vec{F} = (4\hat{i} + 3\hat{j} - 5\hat{k}) \) N is acting on a body making an angle \( \theta \) with the horizontal. Then the angle \( \theta \) is

The dimensional formula of force is:

The moment of the couple formed by the forces \(5\hat{i}+\hat{k}\) and \(-5\hat{i}-\hat{k}\) acting at the points (9, -1, 2) and (3, -2, 1) respectively, is

In Force current analogy, stiffness constant K is analogous to__

If three forces acting on a rigid body are in equilibrium, then they must:

A truss ABC loaded at B with a force of 10 kN as shown in the figure. The force in the member AC is:

The general form of a central force is represented by \(\overrightarrow F = \frac{C}{r^n}\hat r\) (C = constant) known as Inverse Power law. 
A. The force represented by above equation will be attractive if C < 0.
B. The force represented by above equation will repulsive if C < 0.
C. The force represented by above equation will be repulsive if C > 0.
D. The force represented by above equation will be attractive if C > 0.
Choose the correct answer from the options given below.

Gravitational force between two masses \(m_1\) and \(m_2\) separated by a distance r is
A. central force
B. non-central force
C. attractive force
D. repulsive force
E. directly proportional to the distance between \(m_1\) and \(m_2\)
Choose the correct answer from the options given below.

A person is standing in an elevator. In which situation, he experiences weight loss?

Two cylindrical vessels of equal cross-sectional area 16 cm² contain water upto heights 100 cm and 150 cm respectively. The vessels are interconnected so that the water levels in them become equal. The work done by the force of gravity during the process, is [Take, density of water = 10³ kg/m³ and g = 10 ms^–2]

The velocity of a small ball of mass ‘m’ and density \(d_1\), when dropped in a container filled with glycerin, becomes constant after some time. If the density of glycerin is \(d_2\), then the viscous force acting on the ball, will be

A force of 10 N acts on a charged particle placed between two plates of a charged capacitor. If one plate of capacitor is removed, then the force acting on that particle will be

A \(\sqrt{34}\) m long ladder weighing 10kg leans on a frictionless wall. Its feet rest on the floor 3m away from the wall as shown in the figure. If F_f and F_w are the reaction forces of the floor and the wall, then ratio of \(\frac{F_w}{F_f}\) will be: (Use g = 10 m/s²)

Two objects of equal masses placed at certain distance from each other attracts each other with a force of F. If one-third mass of one object is transferred to the other object, then the new force will be

A force on an object of mass \(100\ g\) is \((10\hat i+5\hat j)\ N\). The position of that object at \(t = 2s\) is \((a\hat i+b\hat j)\ m\) after starting from rest. The value of \(\frac ab\) will be _______ .

A block of mass 40 kg slides over a surface, when a mass of 4 kg is suspended through an inextensible massless string passing over a frictionless pulley as shown below.
The coefficient of kinetic friction between the surface and block is 0.02. The acceleration of the block is (Given g = 10 ms^–2)

Three identical charged balls each of charge \(2\) \(C\) are suspended from a common point \(P\) by silk threads of \(2\) \(m\) each (as shown in figure). They form an equilateral triangle of side \(1\) \(m\). The ratio of net force on a charged ball to the force between any two charged balls will be:

A mass of \(10\) kg is suspended vertically by a rope of length \(5\) m from the roof. A force of \(30\) N is applied at the middle point of rope in horizontal direction. The angle made by upper half of the rope with vertical is \(θ\) = \(tan^{–1} (x × 10^{–1})\). The value of \(x\) is _______.(Given, \(g = 10\; m/s^2\))

The efficiency of a Carnot’s engine, working between steam point and ice point, will be

The magnitude of Coriolis acceleration (expressed in terms of \( g \), the acceleration due to Earth's gravity) for a particle of mass \( m \) moving with a velocity \( 10^4 \) cm/s horizontally along Earth's surface at the North Pole is about:

An astronaut is standing on an asteroid when he accidentally drops a wrench. He observes that the gravitational acceleration on the asteroid is 2.4 m/s². If he had thrown the wrench at an upward angle instead, he would have found the gravitational acceleration on the asteroid to be

Dimension of force is: