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Unformatted text preview: Physics210 revision for quiz 1 Things to memorize: forces acting all of sum vector where = = net net F a m F Unit of a force: 1Kg . m / s2 = 1 N=1 Newton v k F r = cos r F r F W = x F dx F W f i f i x x x x x x x tot = = lim kx F x- = work exerted by spring (Hookes law) 2 2 1 mv K and i f net K K W- = If there is a force of friction acting, we can extend the work-kinetic energy theorem as: =- K d f W k Average power ] 1w 1watt [J/s = = = t W P Instantaneous power dt dW t W P t = = lim but v = = F P r d F dW GPE: mgy U g = g U W = Work done on the system equal to the change in the gravitational potential energy. f f i i U K U K + = + Conservation of mechanical energy d f U K k- = + f f i i f U K U K W + = + + Changes in Mechanical Energy for Non-conservative Forces density: V M = pressure: Fluid assumed at rest exerts a force perpendicular to a surface in contact...
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