AS101 Lecture 12

AS101 Lecture 12 - AS101 Lecture 12 Logistics Homework 5 is...

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AS101 Lecture 12 Logistics: • Homework 5 is available • Start reading Chapter 5 Last Lecture: • Applications of Newton’s Laws • Weight, Orbits, Tides • Conservation of angular momentum Today’s Lecture: • Energy • Tides • Atom, light – if time permits MIDTERM 1 on Thursday Oct 21 In class Covers material up to today’s class Close Book, Notes etc. Bring calculator – No cell phones or PDAs
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Energy Energy is needed to make matter move Since orbits describe motion, we need to understand its role in orbit
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Basic Types of Energy Kinetic (motion) Radiative (light) Stored or potential Energy can change type but cannot be destroyed.
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Kinetic energy The energy due to the motion of an object is its kinetic energy Mathematically, speaking: K.E. = (1/2) m v 2 A fast moving object has significantly more kinetic energy than a slower moving object (goes as the square - but not inverse square !)
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Kinetic Energy Energy of motion: Kinetic Energy • E kinetic = ½ m v 2 m is mass v is velocity • Units: 1 Joule – 1kg m 2 /s 2 • Example 1: A 1kg ball traveling 5 m/s E=½(1kg)(5m/s) 2 = (½)25 kg m 2 /s 2 = 12 J • Example 2: Energy in 1kg ball dropped for ½s: V = g t = (9.8 m/s2)(1/2 s) = 4.9 m/s E = 1/2 mv 2 = ½(1kg)(4.9m/s) 2 = 12 kg m 2 /s 2 =12J Farrah Singh: How much energy is in a ball traveling 10m/s
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Joule: An Unit of energy
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Thermal Energy: The collective kinetic energy of many particles (for example, in a rock, in air, in water) Thermal energy is related to temperature but it is NOT the same.
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AS101 Lecture 12 - AS101 Lecture 12 Logistics Homework 5 is...

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