Moment of inertia is the property of an object by virtue of which it opposes any change in its state of rotation about an axis. The inertia of rotational motion is called moment of inertia. General motion of a rigid body consists of both the translational motion and the rotational motion. If the relative distance between the particles of a system do not changes on applying force, then it called a rigtd body. (xi) The position of centre of mass of an object changes translatory motion but remains unchanged in rotatory motion,Ī rigid body performs a pure translational motion, if each particle the body undergoes the same displacement in the same direction in given interval of time.Ī rigid body performs a pure rotational motion, if each particle of the body moves in a circle, and the centre of all the circles lie on a straight line called the axes of rotation. (x) In symmetrical bodies having homogeneous distribution mass the centre of mass coincides with the geometrical centre the body. (ix) The centre of mass of an object need not to lie with in the object. (viii) The position of centre of mass depends upon the shape, size and distribution of the mass of the body. (vii) It means isolated system will remain at rest if it is initially rest or will move with a same velocity if it is in motion initially. (vi) Centre of mass of an isolated system has a constant velocity. (v) If accelerations of the particles are a 1, and a 1respectively, then acceleration of the centre of mass (iv) If in a two particle system, particles of masses m 1 and m 2 moving with velocities v 1 and v 2 respectively, then velocity the centre of mass Iii) If position vectors of particles of masses m 1 and m 2 are r 1 and r 2respectively, then (ii) Position of centre of mass from m 2 = (m 1d) / m 1 + m 2 then position vector of centre of mass ofĬhoosing O as origin of the coordinate axis. If a system consists of n particles of masses m 1, m 2, m 3 ,… m n having position vectors r l, r 2, r 3,… r n. So, go ahead and check the Important Notes for Class 11 Physics Rotational Motion from this article.Ĭentre of mass of a system is the point that behaves as whole mass of the system is concentrated at it and all external forces are acting on it.įor rigid bodies, centre of mass is independent of the state of the body i.e., whether it is in rest or in accelerated motion centre of mass will rermain same. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. Units are written with a roman, sans-serif font ( m, N, ℃) as are mathematical operations with numbers and units ( 7 kg × 10 m/s ÷ 3 s = 23.3 N).Candidates who are pursuing in Class 11 are advised to revise the notes from this post.Mathematical symbols use a roman, serif font ( ½, +, √, cos) - except when they are applied to calculations with units.Scalar quantities ( m, K, t) and the magnitudes of vector quantities ( F, g, v) are written in an italic, serif font - except for Greek symbols ( α, τ, ω), which use a roman serif font.Vector quantities ( F, g, v) are written in a bold, serif font - including vector quantities written with Greek symbols ( α, τ, ω).These are the conventions used in this book. Reference space & time, mechanics, thermal physics, waves & optics, electricity & magnetism, modern physics, mathematics, greek alphabet, astronomy, music Style sheet
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