PHYSICS 1L03 Chapter Notes - Chapter 5: Conservation Law, Momentum, Net Force
21 Mar 2018
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Document Summary
A position in space mathematically described by a vector rc. m: rc. m = 1/m*mi*ri, in component form, rc. m = (xc. m, yc. m, zc. m) with. System of discrete particles: a discrete particle is an object of negligible volume that is physically separated from all other particles in system, xc. m = (x1*m1 + x2*m2) / (m1 + m2) A continuous object: position parameters of a continuous object are ri = (xi, yi, zi) for particles and are time independent. Leads to a rigid body: the distance between any two points on a rigid body remains constant in time. Centre of mass in acceleration terms: m*ac. m = mi*ai = fnet. The total linear momentum of an isolated system of objects (ie. system on which no forces act is conserved) Changes of linear momentum and newton"s second law. Equation: fnet = m*a = (m*v)/t = p/t. The laws of mechanics apply equally well to objects of variable mass.
