CAS AS 101 Lecture 4: Chapter 4
16 Oct 2016
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Acceleration: any change in velocity (units of speed/time) All falling objects accelerate at the same rate (not counting friction of air resistance) Galileo showed that g is the same for all falling objects regardless of mass. A net force changes momentum, which generally means an acceleration. Rotational momentum of a spinning or orbiting object is known as angular momentum. Mass: the amount of matter in an object. Weight: the force that acts upon an object. Weightlessness is due to a constant state of free-fall. Newton realized the same physical laws that operate on earth also operate in the heavens. Ne(cid:449)to(cid:374)"s (cid:1005)st law of motion: an object moves at a constant velocity unless a net force acts to change its speed or direction. Force =rate of change in momentum force. Ne(cid:449)to(cid:374)"s (cid:1007)rd law of motion: for every force, there is always an equal and opposite reaction. Objects continue at constant velocity because of conservation of momentum.
