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 P: 247 Here is an animation from Wikipedia : http://en.wikipedia.org/wiki/File:Torque_animation.gif The angular momentum is given by the Cross product of r and p We can see that the direction would be perpendicular to the direction of rotation of the particle (as shown in the animation) I don't think this really makes sense, how is the vector nature of angular momentum justified ? How can one get an intuitive sense about the direction of angular momentum ?