ncert solutions physics class 11th

According to the Class 11 Physics Chapter 6 System of Particles and Rotational Motion, for a rigid body to be in complete equilibrium, two conditions should be met:

• Net external torque = 0 (rotational equilibrium)
• Net external force = 0 (translational equilibrium)

The condition for equilibrium in rotational motion ensures that the body is not rotating or accelerating linearly. It is important in engineering and static structures to maintain stability like buildings or bridges.

The moment of inertia of a body about any axis to its moment of inertia about a parallel axis through the center of mass is the parallel axis theorem.
It states:
I = Ic + Mh2
Ic is the moment of inertia about the center
I is the moment of inertia of the body
h2 is the square of the distance between the two axes
M is the mass of the body

To master the Class 11 Physics Chapter 3 Motion In A Plane, the students need to focus on thoroughly understanding vectors, and practice problems involving circular motion and projectile, for clarity, students should draw diagrams. They should memorize the key formulas, solve NCERT examples and attempt past year questions. For building strong conceptual clarity, they need regular practice with component resolution and vector addition.

When an object moves in two dimensions, vectors help in representing quantities like velocity, acceleration, and displacement. They allow easy subtraction, addition, and resolution into components. It helps in simplifying the analysis of complex motions like circular motion, projectiles, and motion under combined forces.

When an object moves around a circular path at a constant speed, it is called the uniform circular motion. The velocity changes while the speed remains constant because its direction keeps on changing. The centripetal acceleration is responsible for this change, which is directed towards the center of the circle.

Yes, according to the Motion in a Straight Line, for a moving object, the displacement can be zero, as it is the net change in position. It can also be defined as the shortest path between start and end points. If an object moves from a starting point and returns to the starting point, then the final position is the same as the initial position, and the net displacement becomes zero. However, the distance covered by a moving object can never be zero. The distance can be zero only if the object has not moved at all.

The relative velocity is an object's velocity which may itself be in a motion as observed from a particular frame of reference. In a straight line (one dimension) if object A has velocity vA and object B has velocity vB, then the velocity of object B relative to object A (vBA) is given by vBA=vB? vA. Similarly, the velocity of A relative to B is v AB =vA? vB. It helps analyze situations like overtaking cars or objects moving towards/away from each other.