Astronomy 1021 Lecture Notes - Lecture 7: Celestial Pole, Circular Motion, Net Force
25 Oct 2016
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Document Summary
Polaris is not the brightest star in the sky. Polaris is closest star to ncp, hence the name of north pole star. We can describe many phenomena in the universe - from small to very large scales. By using only a few simple laws/concepts: Vector (number and direction): displacement, velocity, acceleration acceleration. Can feel acceleration (cid:523)e. g. train or plane(cid:524), whereas you don"t feel constant speed. Ball on string: same speed (cid:498)in uniform circular motion(cid:499), changing direction. For any type of circular motion, there is an acceleration. Even though speed is same, velocity is not. An object is initially stationary, we then drop it. After 1 second, will be moving at speed of 10 m/s, after 2 seconds it will be moving at 20 m/s, and so on until it hits the ground. At the earth"s surface: g=(cid:883)(cid:882) m/s squared. At the moon"s surface: g=(cid:883). 7 m/s squared.
