3)Scalar Product(Dot Product) C=A·B= B·cos ARcos Suppose:A∥/B Then:A.B=A.BA·A=A B Suppose:A∥/-B Then: AB=-AB B EXample: W=F s: dw= F dr3) Scalar Product (Dot Product)   ABcos C A B A B cos = =  =       B  A   A B   Suppose: // AB = AB   Then: 2 A A = A   A B   Suppose: //− AB = −AB   Then: B  A  A  B  Example: W F S dW F dr     =  ; = 