sum_lecture03

# sum_lecture03 - T he Physics of L ight & Sound Work, Energy...

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The Physics of Work, Energy & Power Drs. Paulson and Scully

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Pressure If I stand on some soft ground, I sink. There is a net force : my weight overcomes the ground’s normal force . Now suppose instead I lie on the same ground but I do not sink. My weight didn’t change so what is different? Pressure is the quantity that determines whether or not the ground yields. Pressure is the force per unit area: P = F A N/m 2 or Pascals (Pa)
Suppose that I apply a force to an object and move that object a distance x. I have done work on the object. W = F x The amount of work done on the object is the energy change of that object. W = ∆ E Work is force x distance which is a newton x meter or a kg kg× m/s 2 ×m which would be a kg∙ m 2 /s 2 . We call this a Joule .

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There are many types of energy. There is the energy of motion which we call kinetic energy : KE = 1 2 mv 2 There is gravitational potential energy which
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## This note was uploaded on 05/23/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Summer '08 term at James Madison University.

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sum_lecture03 - T he Physics of L ight & Sound Work, Energy...

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