Laws of Motion | JEE Main 2020 Solutions | JEE Physics | Mohit Goenka

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Eduniti - Physics by Mohit Goenka brings a series of best solutions of JEE Main 2020 physics questions. In this video we discuss all 6 questions on Laws of Motion asked in JEE Main 2020.

About Faculty-
Completed Bachelors and Masters from IIT Kharagpur. Having an experience of +3 Years in teaching I reckoned the urge within me to help students appreciate the subject by delivering the toughest concept in simplest manner through practical demonstrations and visual aids.

Q1 - A mass of 10 kg is suspended by a rope of length 4 m, from the ceiling. A force F is applied horizontally at the mid-point of the rope such that the top half of the rope makes an angle
of 45o with the vertical. Then F equals (Take g = 10 ms–2 and the rope to be massless)

Q2 - A small ball of mass m is thrown upward with velocity u from the ground. The ball experiences a resistive force mkv2 where v is its speed. The maximum height attained by the ball is

Q3 - An insect is at the bottom of a hemispherical ditch of radius 1 m. It crawls up the ditch but starts slipping after it is at height h from the bottom. If the coefficient of friction between the ground and the insect is 0.75, then h is

Q4 - A particle of mass m is fixed to one end of a light spring having force constant k and upstretched length l. The other end is fixed. The system is given an angular speed about the fixed end of the spring such that it rotates in a circle in gravity free space. Then the stretch in the spring is

Q5 - A spring mass system (mass m, spring constant k and natural length l) rests in equilibrium on a horizontal disc. The free end of the spring is fixed at the center of the disc. If the disc together with spring mass system, rotates about it’s axis with an angular velocity  (k  m2), the relative change in the length of the spring is best given by the option

Q6 - A bead of mass m stays at point P(a, b) on a wire bent in the shape of a parabola y = 4Cx2 and
rotating with angular speed  (see figure). The value of  is (neglect friction)

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