4)Vector Product (Cross Product C= AxB C=AXB C=lAx B= AB sine B日 Direction: determined by right-hand rule Suppose:A∥BorA∥-B Then:AxB=0A×A=0 Example:M=F×F;L=F×mv4) Vector Product (Cross Product) C = A B = ABsin   C A B    =  B  A   C A B    =  A Bor A B     Suppose: // //− A B = 0   Then: A A = 0   Example: M r F L r mv       =  ; =  Direction: determined by right-hand rule c