Define centre of mass and centre of gravity? When will they be equal?
Define centre of mass and centre of gravity? When will they be equal?
A hypothetical point at which the whole mass of a body is considered to be concentrated is known as centre of mass.
While the hypothetical point at which whole weight of a body is considered to be concentrated is known as centre of gravity.
As we know weight is g times the mass of the body and g decreases with altitude, if we ignore this variation of g over the vertical dimension of body(I e. in uniform gravitational field), then it's centre of mass and centre of gravity will be equal.