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Astronomy & Astrophysics
Stefan Mochnacki

Universal Law of Gravitation: 1. Every mass attracts every other mass 2. Attraction is directly proportional to the product of their masses 3. Attraction is inversely proportional to the square of the distance between their centers -because of momentum conservation, orbiting objects ORBIT AROUND THEIR CENTER OF MASS RD -NEWTON AND KEPLERS 3 LAW laws of gravity and motion showed that the relationship between the orbital period and average orbital distance of a system tells us the total mass of the system -Newtons law applies to other objects not just planets (the force that makes things fall on earth is same force that keeps planets in orbit!) and can be used to measure mass of orbiting systems force of gravity (f)= m x m2d squared increase mass of object = increase in force (cuz mass is multiplied) increase in distance btw objects = decrease in force (cuz distance is divided!) -when gravity brings objects together ( 1 law of G), it creates gravitational potential energy LIGHT- a form of energy -measure flow of energy in light in WATTS - 1 watt = 1 joules - white light is made up of many diff colours -light and matter interact through : 1. Emission (light bulb emits visible lightlight come from electrical potential energy 2. Absorption (your hand absorbs some of the light when you put near a light bulb and creates warmth) 3. Transmission (glass transmits light, allows light to pass through) -transparent objects transmit light www.notesolution.com
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