Impulse vector? Me? X direction component of x = 0.06 1n.s? ; ? There are large and small components in the Y direction, Iy = 0.007N.s Newton-seconds.

The content of the above line is expressed in the form of two vectors: X axis and Y axis. Size and direction can be expressed concisely at the same time, that is, I=(0.06i+0.007j)N.s? This formula is obviously more intuitive and concise than the expression in the first line and should be mastered.

In this formula, I, I and J are bold, representing vectors, and I and J are unit vectors in X and Y directions, that is, they represent X and Y forward directions respectively.