788 Work and Energy 87-187-3 Work and Power(P147-156) Work w Provides a link between force and energy 力的空间累积效应:F,F 1. Work done by a constant force(P148) W=F·r=( F cos o)r=F△x a Fcos Work is product of the magnitude of e displacement of the force 8203T0 △x parallel to the displacement7&8 Work and Energy §7-1&7-3 Work and Power (P147-156) Work W Provides a link between force and energy. 1. Work done by a constant force(P148) Φ Φ W F r F r F x =  = ( cos) = x  力的空间累积效应: F, r W   Work is product of the magnitude of the displacement of the force parallel to the displacement