PHYS 1003 Lecture Notes - Lecture 12: Projectile Motion, Classical Mechanics
26 Dec 2017
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Description: newtonian physics strictly applies only to point particles. The objects we deal with are actually not single points, but aggregates of atoms. It is possible to calculate a centre of. Mass, which is the point at which all of the actual mass can be considered to reside to use. The term centre of gravity is a similar concept, the position within the object at which the force of gravity is assumed to act. The centre of mass has cartesian coordinates xcom, ycom and zcom. Example: 2 equal masses then cm is half way between them or if one mass is twice the other. Cm is nearer to the larger mass (check if makes sense) Tips: make one of the masses the origin such as x1 as origin to eliminate one term. Also have r in km to have answer in km. If has more than two masses then com lies between all three masses.
