CAS AS 101 Chapter Notes - Chapter 4: Orbital Period, Escape Velocity, Angular Momentum
8 Sep 2016
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Speed: rate at which an object moves, m/s. Velocity: speed and direction, example: 10 m/s, due east. Acceleration: any change in velocity units of speed/time (m/) All falling objects accelerate at the same rate (not counting friction of air resistance) If we didn"t have air friction, everything would fall at the same rate. Galileo showed that g (acceleration due to gravity) is the same for all falling objects, regardless of their mass. A net force changes momentum, which generally means an acceleration (change in velocity) Rotational momentum of a spinning or orbiting object is known as angular momentum. Mass: the amount of matter in an object, does not change. Weight: the force that acts upon an object, can change, example: free fall you have no weight, weight is different on the moon and on different planets. Newton realized that the same physical laws that happen on earth also apply to the universe (gravity).
