Is rotation important for JEE mains?

You can expect at most one question from this chapter in JEE . This chapter forms a basis for the next chapter called rotation ,which is quite important for JEE.So I would suggest you don’t skip this chapter. Concepts of circular motion will repeatedly come in Mechancis so don’t skip it.

Is the total energy of the rotating disk conserved in the experiment?

Conservation of Energy in Rotational Motion. Energy is conserved in rotational motion just as in translational motion.

Does no slip mean no friction?

Slipping means that surfaces slide with respect to each other–there is relative motion between the surfaces. There may or may not be friction. If there is no slipping, then the surfaces do not slide at the point of contact. There may or may not be friction involved.

What are the conditions for rolling without slipping?

The wheel rolls without slipping only if there is no horizontal movement of the wheel at the contact point P (with respect to the surface/ground). Thus, the contact point P must also have zero horizontal movement (with respect to the surface/ground).

Does angular momentum change after collision?

In a closed system, angular momentum is conserved in all directions after a collision. Since momentum is conserved, part of the momentum in a collision may become angular momentum as an object starts to spin after a collision.

When can you use conservation of angular momentum?

Angular momentum is conserved when net external torque is zero, just as linear momentum is conserved when the net external force is zero.

For which of the following situations would mechanical energy be conserved?

If only internal forces are doing work (no work done by external forces), then there is no change in the total amount of mechanical energy. The total mechanical energy is said to be conserved.

Do you think Force energy and power are associated with rotational motion?

Power always comes up in the discussion of applications in engineering and physics. Power for rotational motion is equally as important as power in linear motion and can be derived in a similar way as in linear motion when the force is a constant. The linear power when the force is a constant is P=→F⋅→v P = F → · v → .