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lec04_ddn

# lec04_ddn - Continuing Issues Phys 221 Lab questions Dr...

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Continuing Issues Phys 221 Lab questions – Dr. Lewicki, Room 142 I-clicker Problems – Dr. Saxena, Room 176 8/30/11 1

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8/30/11 3 From Mechanics (PHYS 220) • Energy Conservative Forces: Kinetic Energy: associated with the state of motion Potential Energy: associated with the configuration of the system Work done by a conservative force is independent of path.

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8/30/11 4 Gravitational Potential Energy Electric Potential Energy 2 2 1 r m m G F g = 2 2 1 r q q k F e = U=0 at r = Potential energy : can be positive or negative Field forces push object into area with lower potential energy: Potential energy decreases , work is done on object – for example, kinetic energy of the object may increase (speed) Total energy is conserved Potential Energy PE = G m 1 m 2 r PE = k q 1 q 2 r
8/30/11 5 Potential Energy of Two Points PE elec = k q 1 q 2 r r m m G U g 2 1 = Gravity: always attraction. U is more negative (“lower”) when objects are closer q 1 q 2 < 0 : attraction.

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lec04_ddn - Continuing Issues Phys 221 Lab questions Dr...

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