April 23rd, 2017, 04:06 AM  #1 
Newbie Joined: Apr 2017 From: UK Posts: 4 Thanks: 0  rate of angular momentum of a point
Hi, Does anyone know how to calculate the rate of angular momentum of a point,Q? Google is not helping me right now. Thanks 
April 23rd, 2017, 04:33 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 3,017 Thanks: 1603 
Depends on the problem statement ... you have a specific one in mind?

April 23rd, 2017, 05:05 AM  #3 
Newbie Joined: Apr 2017 From: UK Posts: 4 Thanks: 0 
I need to find the rate of angular momentum of the centre of mass. Its for a biped robot.

April 23rd, 2017, 06:17 AM  #4  
Math Team Joined: Jul 2011 From: Texas Posts: 3,017 Thanks: 1603  Quote:
$\vec{L} = \vec{r} \times \vec{p} = \vec{r} \times m\vec{v}$ Also, you do understand that angular momentum and rate of change of angular momentum are two different things?  
April 23rd, 2017, 07:44 AM  #5 
Newbie Joined: Apr 2017 From: UK Posts: 4 Thanks: 0 
I beg your pardon, I do mean the rate of change. Am I right in thinking to get the rate of change you could take the derivative with regards to time of your above equation? 
April 23rd, 2017, 08:16 AM  #6 
Math Team Joined: Jul 2011 From: Texas Posts: 3,017 Thanks: 1603 
the time rate of change of angular momentum is net torque ... $\dfrac{dL}{dt}=\tau_{net}$ 
April 23rd, 2017, 10:19 AM  #7 
Newbie Joined: Apr 2017 From: UK Posts: 4 Thanks: 0 
Thank you


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angular, momentum, point, rate 
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