A disc is rotating with angular speed ω. If a child sits on it, what is conserved (a) linear momentum (b) angular momentum (c) kinetic energy (d) potential energy.

Answer: (b). The child-disc interaction forces are internal; no external torque about the axis. So angular momentum is conserved (KE is lost, as in an inelastic collision). So the answer is (b).

A disc is rotating with angular speed ω. If a child sits on it, what… | NEET 2002 (AIPMT)

Q95NEET 2002 · AIPMTEasy

Angular Momentum & its Conservation

A disc is rotating with angular speed $\omega$ . If a child sits on it, what is conserved

Show answer and solution

Answer: (b)

The child-disc interaction forces are internal; no external torque about the axis.
So angular momentum is conserved (KE is lost, as in an inelastic collision).
So the answer is (b).

Report a mistake

More questions on Angular Momentum & its Conservation

Initial angular velocity of a circular disc of mass M is ω₁. Then two small spheres of…JEE Main 2002 (AIEEE)
A thin circular ring of mass M and radius r is rotating about its axis with a constant…NEET 1998 (AIPMT)
A particle of mass m = 5 is moving with a uniform speed v = 3√(2) in the XOY plane along…NEET 1991 (AIPMT)
When the position vector r = xi + yj + zk changes sign as -r, which one of the following…JEE Main 2026 (28 Jan, Shift 2)
A particle of mass m is projected with velocity V making an angle of 45° with the…MHT CET 2026 (14 May, Shift 2)
A particle of mass m is projected with speed v at 45° with the horizontal. The magnitude…MHT CET 2026 (14 May, Shift 1)
The position of an object having mass 0.1 kg as a function of time t is given as r =…JEE Main 2026 (2 Apr, Shift 1)
Two cars A and B each of mass 10³ kg are moving on parallel tracks separated by a…JEE Main 2026 (21 Jan, Shift 2)

Angular Momentum & its Conservation question from NEET 2002 (AIPMT)

More questions on Angular Momentum & its Conservation