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Lecture

# energy and electricity.docx

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School
Department
Physics
Course
PHYS 1114
Professor
B.Hughes
Semester
Winter

Description
Chapert 5- Energy -a quantity -can change -can't be destroyed -transferred from object to object -uncondensed matter -essential to all life -measured in Joules (J) The Energy of Motion: Kinetic Energy -the energy due to motion of a mass(m) with a speed(v) is K=1/2mv 2 *When you drop something: Kinetic Energy =mg (delta y) Gravitation Potential Energy is the energy stored in the gravitational interaction between an object and the Earth -for an object of mass(m), at a vertical position(y), gravitational potential energy is Ug=mgy -where y must take up as positive -you can choose where y=0 -for an object of mass(m), at a horizontal position(x), gravitational potential energy is Ug=mgx -where x must take right as positive -you can choose where x=0 The change in kinetic energy depends on Fx and the displacement while F is applied formula for work : W=FD ( aka W=F (XeltaX) aka W= l F l cos beta (deltaX) ) where beta is the angle between F and delta X Work is positive when it adds energy to the system and work is negative when it takes away energy from the system Friction transfers mechanical energy out of a system the a
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