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
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 !)
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
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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