# Essay on Study Guide Science

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Unit 2: The Ordered Universe Assignment 1. Why was the Ptolemaic system accepted as an explanation of celestial motion for over a thousand years? What did it explain? What system challenged the idea that Earth was the center of the universe? The Ptolemaic system says that the Earth is the center of the universe. Everything else surrounded the Earth. The Copernican system challenged the belief that Earth was the center of the universe. The major difference between the Ptolemaic and Copernican universes is that the Copernican universe puts the Sun at the center rather than the Earth. Both systems both assumed that all orbits are circular though. 2. What were Tycho Brahe’s principal contributions to science? How did he try to resolve the…show more content…
His hypothesis proved successful in that every object dropped met the surface at the same rate. 5. A hockey player hits a puck at one end of an empty skating rink. The puck travels across the ice in a straight line until it is stopped by the goal at the other end. Explain how each of Newton’s laws of motion applies to this situation. Newton’s first law, often called the law of inertia, says that a moving object will continue moving in a straight line at a constant speed, and a stationary object will remain at rest unless pushed. This means that all objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion (the hockey puck) will maintain this state of motion. Newton’s second law says the acceleration produced on a body by a force is proportional to the magnitude of the force and inversely proportional to the mass of the object. In simpler terms, this means the greater the force, the greater the acceleration; but the more massive the object being acted on by a given force, the smaller the acceleration. Newton’s third law says that or every action there is an opposite reaction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard. 6. According to Newton, what are the two kinds of motion in the universe? How did this view differ from those of previous scholars? Newton two different kinds of motion uniform