PHYS 1501Q Chapter Notes - Chapter 8, 9: Conservative Force, Escape Velocity, Net Force
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19 Dec 2017
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PHYS 1501Q Full Course Notes
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We can find the change in potential energy. Conservative forces - gravitational force, spring force. Work kinetic energy theorem conservation of mechanical energy. Work done by a conservative force is path independent. On a closed path, w = 0. Non conservative forces - friction, normal, tension, etc. = b u a = w a b. Gravitational potential energy gravity = 0 (when work by non-conservative forces is zero) Escape velocity - minimum initial speed we need to launch something from the surface of the planet so that it never returns vf = re m v. Because the ball is very far away . U gravity (as long as you measure from the equilibrium length) Non conservative forces change the mechanical energy: work and potential energy. Work done by kinetic friction f k d x m gcos x gh. K h gcos ( sin cot ) speed at the bottom of the ramp box.