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Word Count: 298
Electrical energy in the home E Fq E electric field strength F force q charge E kqr2 E electric field strength k 900 x 109 q charge r separation of charges F Eq F force E electric field strength q charge R VI R resistance V potential drop I current R klA R resistance k P VI P V2R or P I2R P Power V Voltage rise I Current R resistance W VIt W Energy V Voltage rise I current t time Moving about vav 916r 916t vav average velocity 916r displacement change in position 916t time aav 916v 916t 916v the change in velocity 916t time interval When t 0 the velocity is u Thus aav v-ut Where v is the velocity at time t v - u at v u at F ma W - air resistance ma When dense objects fall through small distances near the surface of the Earth it is usually quite reasonable to assume that the air resistance is negligible Thus W ma mg ma where g is the gravitational field strength g a W weight m mass 61669F mv2r 61669F centripetal force the net force on an object traveling in a circular path at constant speed It is directed towards the centre of the circle m mass v constant speed r radius Ek 12mv2 Ek kinetic energy m mass v speed W Fs W work F magnitude of force s displacement in the direction of the force p mv p momentum
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