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### 18 Cards in this Set

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• Back
 Work W = Fdcos theta, theta - angle between Fand d When F is parallel to d, W= Fd Scalar(no direction) Work done by normal force 0 (perpendicular, cos90 = 0) Power Work/time = W/t Kinetic Energy Energy due to motion = 1/2 mv^2 Work Energy theorem W = KE final-KE initial Potential Energy Energy an object has by virtue of its position PE = mgh Work done by gravity depends only on initial and final positions of the object, independent of the path, gravity - conservative force Is friction a conservative force? No, friction depends on the path object takes Total Mechanical Energy E = KE+PE Conservation of Total Mechanical Energy KEi + PEi = KEf + PEf Heat transfer 1 conduction (hot skillet--->hand) 2.convection (by motion of fluid) 3.radiation - absorption of energy carried by light waves) Momentum p= mv Impulse J = change in momentum Conservation of momentum total P initial = total p final Elastic Collision Total momeentum and total KE are conserved Inelastic Collision Total momentum is conserved but total kinetic energy is not conserved Perfectly inelastic collision Objects stick together afterwards Angular Momentum L= Iw, conserved