Laws of Motion Questions

A wire, which passes through the hole in a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground as shown in the figure. The bead is released from near the top...

A body is sliding down an inclined plane (angle of inclination 45o). If the coefficient of friction is 0.5 and g = 9.8 m/s2. then the acceleration of the body downwards in m/s2 is :-...

In the arrangement shown in figure, coefficient of friction between the two blocks is m = . The force of friction acting between the two blocks is :-...

A block of mass 10 kg, moving in x direction with a constant speed of 10 m-1, is subjected to a retarding force F = 0.1 x J/m during its travel from x = 20 m to 30 m. Its final KE will be :...

Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between ...

One end of string of length l is connected to a particle of mass 'm' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed &#39...

A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of 1012/sec. What is the force constant of the bonds connecting one atom with the other ? (Mole wt. of ...

The moment of the force, F→=4i^+5j^-6k^ at (2, 0, –3), about the point (2, –2, –2), is given by:-...

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric fieldE→. Due to the force qE→ , its velocity increases from 0 to 6 m/s in...

A piece of wire is bent in the shape of a parabola y = kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowest point of the parabola ...

A person of mass 60 kg is inside a lift of mass 940 kg and passes the bottom on control panel. The lift starts moving upwards with an acceleration 1.0 ms-2. If g = 10ms-2, the tenstion in the supporti...

The potential energy of a system increases if work is done

Two fixed frictionless inclined plane making an angle 30oand 60o with the vertical are shown in the figure. Two block A and B are placed on the two planes. What is the relative vertical acceleration o...

A block of mass ′m′ is connected to another block of mass ′M′ by a spring (massless) of spring constant ′k′. The blocks are kept on a smooth horizontal plane. Initi...

A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to...

Two masses m1 = 5 kg and m2 = 4.8 kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when lift free to move? (g = 9.8 m/s2)...

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/...

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about scale reading is

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slight...

A spring of force constant 800 N/m has an extension of 5 cm. The work done is extending it from 5 cm to 15 cm is