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Force of Friction on Connected Bodies When bodies are in contact, there are mutual contact forces satisfying the third law of motion. The component of contact force normal to the surfaces in contact is called normal reaction. The component parallel to the surfaces in contact is called friction.In the above figure, `8 kg and 6 kg` are hanging stationary from a rough pulley and are about to move. They are stationary due to roughness of the pulley.The force of friction acting on the rope

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A body moves from point A to B under the action of a force varying in magnitude as shown in figure, then the work done is (force is expressed in newton and displacement in

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Which of the following statement does not specify an example of perfectly inelastic

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Assertion: According to the law of conservation of mechanical energy, change in potential energy is equal and opposite to the change in kinetic energy. Reason: Mechanical energy is not

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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Two particles of equal masses have velocities `v_1 = 4 hati ms^(-1) and v_2 = 4 hatj ms^(-1)` . First particle has an acceleration `a_1 = (2hati + 2hatj) ms^(-2)`, while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path

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Centre of Mass The centre of mass of a body or a system of bodies is the point which moves as though all of the mass were concentrated there and all external forces were applied to it. Hence, a point at which the entire mass of the body or system of bodies is supposed to be concentrated is known as the centre of mass. If a system consists of more than one particles (or bodies) and net external force on the system in a particular direction is zero with centre of mass at rest. Then, the centre of mass will

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The height at which the weight of a body becomes 1/16th of its weight, on the surface of the earth (radius R),

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Assertion: If gravitational potential at some point is positive, then the gravitational field strength at that point will also be zero. Reason: Except at infinity gravitational potential due to a system of point masses at some finite distance cannot be

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Earth’s SatelliteEarth satellites are objects which revolve around the earth. Their motion is very similar to the motion of planets around the Sun. In particular, their orbits around the earth are circular or elliptic. Moon is the only natural satellite of the earth with a near circular orbit with a time period of approximately 27.3 days which is also roughly equal to the rotational period of the moon about its own axis. Also, the speed that a satellite needs to be travelling to break free of a planet or moon’s gravity well and leave it without further propulsion is known

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At what distance from the mean position, is the kinetic energy in a simple harmonic oscillator equal to potential

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A particle is executing S H M of amplitude 4 cm and T = 4 sec. find the time taken by it to move from positive extreme position to half of its

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A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source? Will this source be in resonance with the pipe if both the ends are

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Velocity of sound increases on a cloudy day.

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A stone is dropped from the top of a cliff and is found to ravel 44.1m diving the lastsecond before it reaches the ground. What is the height of the cliff? `g =

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(a) What is the angle between `vecA and vecB` if `vecA and vecB` denote the adjacent sides of a parallelogram drawn form a point and the area of the parallelogram is `1/2 AB` ?(b) State and prove triangular law of vector

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Name the factor on which coefficient of friction

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Three identical blocks each having a mass m, are pushed by a force F on a frictionless table as shown in figure. What is the acceleration of the blocks? What is the net force on the block P? What force does P apply on Q. What force does Q apply on

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Four particles of mass 1kg, 2kg, 3kg and 4kg are placed at the four vertices A, B, C and D of square of side 1m. Find the position of centre of mass of the

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State two essential requisites of geostationary

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