Energy: The conservation of energy must be satisfied(p 足) in all the processes(过程) in the nature.The different types of physical 'motions'are transformed(+t 化) through the important link of energy(纽带)
Energy：The conservation of energy must be satisfied（满 足） in all the processes（过程） in the nature. The different types of physical ‘motions’ are transformed（转 化） through the important link of Energy(纽带）
F16 机械运动 化学能量 气体热运动
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§3-1Work(功) 1. Work done by a constant force The work done by F is iven by g 0 0 W=(F 0)S(3-1) orl W=F.S(3-2) The si unit of w is joule 1Joule=1J=IN m=1kg.m2/s2
§3-1 Work（功） 1. Work done by a constant force F F s The work done by is given by F W F S = (3-2) W = (F cos )S (3-1) (or) The SI unit of W is Joule : 1Joule =1J = 1N·m = 1kg·m2 /s2
箭箭击中100环 学习要用功 方法要对路
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2. Work done by a variable force(变力的功) F is a variable force(3])acting on a particle moving along a curvilinear(曲线) path. Let us find the work done(作功) by it as follows:
2. Work done by a variable force（变力的功） is a variable force (变力) acting on a particle moving along a curvilinear（曲线） path. Let us find the work done （作功）by it as follows ： F i r Fi i