Chapter 9 Linear Momentum and 2 The impulse(冲量) 力的累积效应 F(O)对t积累→>p,Ⅰ F对F积累→)W,E dp d(mu dt It =dp=d (mv) Fdt= p2-p1=mo 2-120 Fat The impulse(冲量) of force ◆冲量力对时间的积分(矢量)7=2FdtChapter 9 Linear Momentum and Collisions 2 The impulse (冲量) 力的累积效应 F r W E F t t p I , ( ) , → →      对 积累 对 积累 2 1 2 1 2 1 d v v      F t p p m m t t = − = −  t m t p F d d( d d v)    = = d d d ( v)    F t = p = m 冲量 力对时间的积分（矢量）  = 2 1 d t t J F t   —– The impulse(冲量)of force  = f i t t J Fdt  