Chapter 8 - Rotational Motion and Equilibrium - Learning Path Questions and Exercises - Conceptual Questions - Page 302: 20

Net torque on the system is zero. The angular momentum is conserved. Since angular momentum is the product of moment of inertia and angular speed of the system, as the child goes towards the center the moment of inertia would decrease, hence angular speed would increase. Thus it results in a dangerous situation.

Net torque on the system is zero. The angular momentum is conserved. Since angular momentum is the product of moment of inertia and angular speed of the system, as the child goes towards the center the moment of inertia would decrease, hence angular speed would increase. Thus it results in a dangerous situation.