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Physics chapters

Circular Motion

5 JEE Main questions · Physics

Dynamics of circular motion

  1. PhysicsJEE Main 21 Jan 2026, Shift 2·Q18·MCQ·Easy–moderate
    Open
    A large drum having radius R is spinning around its axis with angular velocity ω\omega, as shown in figure. The minimum value of ω\omega so that a body of mass M remains stuck to the inner wall of the drum, taking the coefficient of friction between the drum surface and mass M is μ\mu, is :
    1. (1)μgR\sqrt{\dfrac{\mu g}{R}}
    2. (2)2gμR\sqrt{\dfrac{2g}{\mu R}}
    3. (3)g2μR\sqrt{\dfrac{g}{2\mu R}}
    4. (4)gμR\sqrt{\dfrac{g}{\mu R}}
  2. PhysicsJEE Main 2 Apr 2026, Shift 2·Q2·MCQ·Easy–moderate
    Open
    A 0.5 kg mass is in contact against the inner wall of a cylindrical drum of radius 4 m rotating about its vertical axis. The minimum rotational speed of the drum to enable the mass to remain stuck to the wall (without falling) is 5 rad/s. The coefficient of friction between the drum's inner wall surface and mass is . (Take g=10 m/s2g = 10\ \mathrm{m/s^2})
    1. (1)0.1
    2. (2)0.5
    3. (3)0.7
    4. (4)0.3
  3. PhysicsJEE Main 8 Apr 2026, Shift 2·Q3·MCQ·Easy–moderate
    Open
    A car moving with a speed of 54 km/h takes a turn of radius 20 m. A simple pendulum is suspended from the ceiling of the car. Determine the angle made by the string of the pendulum with the vertical during the turning. (Take g=10 m/s2g = 10\ \mathrm{m/s^2})
    1. (1)tan⁡−1(0.5)\tan^{-1}(0.5)
    2. (2)tan⁡−1(0.75)\tan^{-1}(0.75)
    3. (3)tan⁡−1(1.125)\tan^{-1}(1.125)
    4. (4)tan⁡−1(0.25)\tan^{-1}(0.25)

Potential energy and conservation

  1. PhysicsJEE Main 24 Jan 2026, Shift 2·Q5·MCQ·Moderate
    Open
    In case of vertical circular motion of a particle by a thread of length rr if the tension in the thread is zero at an angle 30∘30^\circ shown in figure, the velocity at the bottom point (A) of the circular path is
    (gg = gravitational acceleration)
    1. (1)5gr\sqrt{5gr}
    2. (2)72gr\sqrt{\dfrac72 gr}
    3. (3)4gr\sqrt{4gr}
    4. (4)52gr\sqrt{\dfrac52 gr}
  2. PhysicsJEE Main 6 Apr 2026, Shift 1·Q7·MCQ·Moderate
    Open
    A smooth inclined plane ends in a vertical circular loop, as shown in the figure. A small body is released from height h as shown. If the body exerts a force of three times its weight on the plane at the highest point of circle then the height h=αRh = \alpha R. The value of α\alpha is
    1. (1)2
    2. (2)4
    3. (3)3
    4. (4)6