PHYS 1114 Lecture Notes - Ampere

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20 Mar 2013
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The energy due to motion of a mass(m) with a speed(v) is k=1/2mv2. *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. For an object of mass(m), at a horizontal position(x), gravitational potential energy is ug=mgx. 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 amount of that transfer is given by -l f l d where f is the magnitude of friction and d is the distance travelled. When there is no flow of energy into or out of the system ( for example, when no work is done on the system) the total energy is constant. Ua + ka (+flow) = ub + kb.

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