Archived

This topic is now archived and is closed to further replies.

Some equations...

This topic is 5824 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I was wondering, in the equation Angular_accel = Torque / Inertia. What units are used for each variable? And how might I implement this rotation using radians?

Share this post


Link to post
Share on other sites
Inertia == moment of inertia. The angular accelaration and torqe are vectors and the moment of inertia is a 3x3 matrix (called the inertia tensor). So to implement it you need to work with vectors and matrices.

Share this post


Link to post
Share on other sites
Hmm, ok. But could you give me an example matrix for this rotation? Thanks.

Share this post


Link to post
Share on other sites
Instead of using matrices, do it the real way. Multiply them.

A torque is a force on an arm.
Inertia in generally how much it doesn''t want to move
Angular acceleration is the acceleration of the ball.

Firstly you don''t need inertia to do the basic one.



The forumal is this
Torque = mass * radius^2 *Angular accelertaion

If we use inertia, it is works out as the sum of all the mass*radius after calculating it, so we just replace that in the forumla.
Torque = Inertia * Angular Acceleration


These are the units
Torque : Nm (newton metre)
Angular Acceleration : rad/sec (radians per second)
Inertia : Nm^2 (neton metre squared)
mass : N (newton)
radius : m (metre)


You don''t need to use matrices, you can just multiply the values.
Pretend you are an engineer or physicist, not a mathematician - each is better at different things.



Beer - the love catalyst
good ol'' homepage

Share this post


Link to post
Share on other sites