Motion OF centre OF mass

The figure (A) and (B) shows two different arrangements of a spool being pulled with a constant force F in each case. Identify the direction of motion of centre of mass, and the direction of friction force in each case (i) The centre of mass moves along _______ x-axis in figure (A). (negative/positive) (ii) The frictional force acts along ___________ x-axis in figure (A). (negative/positive) (iii) The centre of mass moves along ____________ x-axis in figure (B). (negative/positive) (iv) The frictional force acts along _____________ x-axis in figure (B). (negative/positive)

A uniform straight rod is placed in vertical position on a smooth horizontal surface and released. As the rod is in motion, the centre of mass moves

Assertion: An object of mass m_1 and another of mass m_2(m_2gtm_1) are released from certain distance. The objects move towards each other under the gravitational force between them. In this motion, centre of mass of their system will continuously move towards the heavier mass m_2 . Reason: In a system of a heavier and a lighter mass, centre of mass lies closer to the heavier mass.

The position of centre of mass does not depend upon the reference frame. Centre of mass depends only upon the mass of the body.

Acceleration Of Centre Of Mass Of System

The motion of the centre of mass is the result of

The motion of the centre of mass of a system of two particles is unaffected by their internal forces.

Write an expression for the position vector of the centre of mass of n-particle system. Also write the equations of motion which govern the motion of the centre of mass