# I Dynamically balance and angular momentum

1. Jun 12, 2016

### sgh1324

https://en.wikipedia.org/wiki/Balancing_of_rotating_masses

See the image in that page.

I know intuitively why a direction of torque is counterclockwise-because of a centrifugal force.

But an direction of angular momentum of that shaft with attached weights (ignore the shaft mass) is southeast direction.

And a torque of that body is an inward of page, which means clockwise direction.

Why I gets this conclusion???? somebody help me.

2. Jun 12, 2016

### Simon Bridge

It is not clear what you are trying to calculate from what, how?

Some notes:
angular momentum points along the rotation axis
torque is rate of change of angular momentum ...

3. Jun 13, 2016

### sgh1324

the direction of angular momentum of that body is southeast direction.

and because of rotation, angular momentum rotates inward direction of page.

so, that means direction of torque(=chage of angular momentum) is clockwise.

but the wiki page said that the torque's direction is counterclockwise.

i cant understand wiki conclusion by reasoning - torque direction is clockwise.

ps from note
angular momentum points along the rotation axis - you means that shaft?