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208- A Stroke of Genius (W.E.P.), Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Power /\ /\ >(O_O)<(( (> <) )) """"""""""""""""" Definition: Power is the work done (or energy converted) per unit time. SI unit: watt (W) or joules per second (J/s), Definition: Potential Energy is a capacity for doing work by virtue of the relative position of various parts of a system Forms Elastic potential energy of a body is the energy stored in the body by virtue of its elastic deformation Hooke's Law: F = kx E.P.E. = ½ F x= ½ k x², Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Work r r (T_T) (l . l)) *u u* Work done by: -frictional and viscous forces, which are always in opposite in the direction of motion, is always negative -force perpendicular to the direction of displacement is zero, Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Energy Ω_Ω (>_<) c(u . u) """""""""" Internal, Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Energy Ω_Ω (>_<) c(u . u) """""""""" Principle of the Conservation of Energy: Energy cannot be created or destroyed; Energy can be converted from one form to another, it can also be transferred from one form to another, Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Work r r (T_T) (l . l)) *u u* Force/N Work Done (area under graph) 0 Displacement/m, Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Power /\ /\ >(O_O)<(( (> <) )) """"""""""""""""" Power = work done/time taken = (force x displacement) / time taken = force x velocity P = W.D / t = (F x s) / t = F x v, Principle of the Conservation of Energy: Energy cannot be created or destroyed; Energy can be converted from one form to another, it can also be transferred from one form to another Forms of Energy :) Chemical: Fuel, batteries :) Electrical: Movement of electrical charges :) Internal and Thermal: Energy of a state of a system :) Mechanical: Kinetic and Potential :) Nuclear: Mass-energy conversion :) Radiant: Electromagnetic radiation :) Sound: Sound waves in a medium, Work, Energy and Power n_n (o_O) (/ . \) --"-"-- © Energy Ω_Ω (>_<) c(u . u) """""""""" Kinetic, Definition: Potential Energy is a capacity for doing work by virtue of the relative position of various parts of a system Forms Gravitional potential energy involves the forces of attraction between masses G.P.E. = mg(h1-h0)