角動量，Angular Momentum

一個A-Level physics既topic......但都唔難既，淨係角動量既話！
好簡單，當一舊野係到轉果陣
佢同軸心既位移( Displacement，s )同速度( Velocity，v )既積就係角動量( L )
L=sv，如果個轉既軌跡係個圓形，s=r，radius of the circle.

係咪好簡單呢！
下集就講深野，力距，Torque同埋角動量守衡，conservation of angular momentum.
好緊張呀