# Physics- Work

 Equation of Work W=F„d = (Fcosθ)d Define Work Scalar Work is positive if the force, or a component of force, acts in the same direction as the displacement Work is negative if a force, or a component of force, acts in the opposite direction of displacement No work if force is perpendicular to displacement, or if there is no displacement cos 0 1 cos 90 0 cos 180 -1 Formula or stretching or compressing a string W=½kx2 Formula for Kinetic Energy K=½mv2 Formula for Potiental Energy: Spring Us=½kx2 Formula for Potiental Energy: Gravitational Ug=mgy Formula of Conserved Energy E0=EK0+U0= K+U What conserves energy? Spring and Gravity What does not conserve energy? (Nonconservative) Friction Formula of Total Energy E0+Wnc=EK0+U0+Wnc=K+U Steps for solving energy problems 1) Draw Diagram2) Indicate Initial and Final Position3) Indicate where gravitational poteintal energy is zero 4) Use E0+Wnc=E Formula of Power P=Work/Time Units of Power (W) Watt1 J/S = 1 WI hp = 746 W Units of Work J (Joule) 1 N*M = I J Formula of Efficiency E = Wout/Ein Formula for Linear Momentum P=mv Authorandreabyerly ID43042 Card SetPhysics- Work DescriptionPhysics - Work Updated2010-10-18T16:42:42Z Show Answers