Chap7_Energy

# Chap7_Energy - Chapter 7 Energy The"money of physics Why...

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Chapter 7 Energy The “money” of physics…

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Why Energy Helps Motion, in general, is difficult to describe scientifically. Using forces, momentum, acceleration, etc. gets complicated because they are all Energy is not a vector; it’s a “scalar” (number). It can help predict motion by calculating how much energy that motion will “cost.”
Potential Energy (PE) Gravitational potential energy of an object is, Potential Energy = Weight x Height Potential energy is stored energy or “energy in the bank.” Unit of energy is Joules.

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Example What is the potential energy of a 6kg bowling ball at a height of 20 meters? What is potential energy at zero height? 20 m 6 kg
Kinetic Energy (KE) Kinetic energy of an object is, Kinetic Energy = ½ x Mass x Speed 2 Kinetic energy is the energy of motion. A stationary object has zero kinetic energy.

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What is the kinetic energy of a 6kg bowling ball, falling from a height of 20 meters, just as it reaches the ground? 20 m
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## This note was uploaded on 04/29/2010 for the course PHYS 100 taught by Professor Nidhalguessoum during the Spring '10 term at American University of Sharjah.

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Chap7_Energy - Chapter 7 Energy The"money of physics Why...

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