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3 Days Timetable: Rotational Motion (2025) | Physics for JEE Main & Advanced PDF Download

Introduction

You’re about to embark on a focused, high-impact 3-day journey through one of JEE Physics’ most powerful and conceptually rich chaptersRotational Motion

This chapter isn’t just about spinning wheels or rotating rods. It’s about understanding how forces, motion, and energy behave when things rotate instead of just moving in straight lines.

From the rolling of a sphere down a ramp to the rotation of planets, rotational motion connects everyday life with deep physics concepts. More importantly, it forms the core of many JEE Main and Advanced questions—often bundled subtly with topics like laws of motion, energy, and gravitation

​Let's take a look now on the timetable:

3 Days Timetable: Rotational Motion (2025) | Physics for JEE Main & Advanced3 - Day Study Plan for Rotational Motion

Day 1: Centre of Mass, Rolling Motion, and Angular Momentum

Day 2: Rotational Motion, Moment of Inertia, and Vector Product of Two Vectors

Day 3: Equilibrium of a Rigid Body, Theorems of Perpendicular & Parallel Axis

Revision + Tests

JEE Exam Resources:

These resources will be invaluable for your preparation and revision of the "Rotational Motion" chapter for the JEE Physics exam.

Good Luck !!

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FAQs on 3 Days Timetable: Rotational Motion (2025) - Physics for JEE Main & Advanced

1. What is the significance of the center of mass in rotational motion?
Ans. The center of mass is crucial in rotational motion as it simplifies the analysis of the motion of rigid bodies. It is the point where the mass of the body can be considered to be concentrated for the purpose of analyzing translational motion. In rotational motion, the dynamics of the system can be described more easily by studying the motion of the center of mass, which helps in determining the moment of inertia and angular momentum.
2. How do you calculate the moment of inertia for different shapes?
Ans. The moment of inertia (I) can be calculated using the formula \( I = \int r^2 dm \), where \( r \) is the distance from the axis of rotation to the mass element \( dm \). For common shapes, there are standard formulas, such as \( I = \frac{1}{12} m L^2 \) for a rectangular plate about an axis through its center, and \( I = \frac{2}{5} m R^2 \) for a solid sphere about its center. These formulas take into account the mass distribution relative to the axis of rotation.
3. What is the difference between rolling motion and sliding motion?
Ans. Rolling motion occurs when an object rotates about its axis while translating along a surface, such that there is no slipping between the object and the surface at the point of contact. In contrast, sliding motion involves the object moving over a surface without rotating or with some rotation but without the point of contact being stationary. Rolling motion is characterized by the relationship \( v = r\omega \), where \( v \) is the linear velocity, \( r \) is the radius, and \( \omega \) is the angular velocity, while sliding motion does not satisfy this relationship.
4. What are the conditions for equilibrium of a rigid body?
Ans. For a rigid body to be in equilibrium, two main conditions must be satisfied: the sum of all forces acting on the body must be zero (\( \sum \vec{F} = 0 \)), and the sum of all torques acting about any point must also be zero (\( \sum \vec{\tau} = 0 \)). This ensures that there is no net force causing linear motion and no net torque causing rotational motion.
5. Can you explain the theorems of perpendicular and parallel axes in relation to moment of inertia?
Ans. The perpendicular axis theorem states that for a planar body, the moment of inertia about an axis perpendicular to the plane is equal to the sum of the moments of inertia about two perpendicular axes lying in the plane and intersecting at a point. Mathematically, this is expressed as \( I_z = I_x + I_y \). The parallel axis theorem states that the moment of inertia about any axis parallel to an axis through the center of mass is given by \( I = I_{cm} + md^2 \), where \( I_{cm} \) is the moment of inertia about the center of mass axis, \( m \) is the mass, and \( d \) is the distance between the two axes.
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