Centre of mass important points and numerical
Today our topic is about centre of mass important points and numerical. This topic is important because we will discuss in this topic key point of centre of mass. If your theory concept is not clear you can't solve the numerical problem. So it is very important to clear your theory concept first to solve the numerical problem.
So we are going to discuss here key theory point for center of mass and then solve the numerical problem easily.
In the previous post we have already discussed about motion of center of mass. If you have read that post i will suggest you to go through that post before learning this post.
Because we have already discussed basic and important point about centre of mass, You can refer that post motion of centre of mass.
Centre of mass important point you must know
Centre of mass always for a rigid bodies, Centre of mass is a point and the specialty of this point we suppose that whole mass of the rigid bodies lies on that point.
Center of mass point may lies inside the rigid body or may lies outside the rigid body depends upon the shape and size of body
This is an imaginary point can be anywhere.
If Centre of mass is taken as origin then its all particle moment or effect is zero about the origin or moment about centre of mass is always zero.
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∑mⱼrⱼ = 0 this is very important result used in rotation.
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Our laws of motion are applicable for point mass, Now in rigid body or system of particle no point mass because in system of particle every particle has mass.
Now we want to apply laws of motion so we can't directly apply laws of motion on system of particle. Hence to apply laws of motion we consider centre of mass for system of particle.
