- #1

- 2

- 0

There's something I struggle to understand.

In the picture I attached to this post , the first drawing is a system with the sum of momentum = 0 (equilibrium).

In the second drawing I increase temporarily the force on point A in order to get and angle of 20° compare to the last position and maintain the angle stable for a moment.

Why when I stop to force the angle of 20° does the system come back to the previous position (after some oscillation) since from my understading the sum of momentum is also at equilibrium?

http://img199.imageshack.us/img199/7277/momentumg.th.jpg [Broken]

For information I'm not a student

Thanks for your help

In the picture I attached to this post , the first drawing is a system with the sum of momentum = 0 (equilibrium).

In the second drawing I increase temporarily the force on point A in order to get and angle of 20° compare to the last position and maintain the angle stable for a moment.

Why when I stop to force the angle of 20° does the system come back to the previous position (after some oscillation) since from my understading the sum of momentum is also at equilibrium?

http://img199.imageshack.us/img199/7277/momentumg.th.jpg [Broken]

For information I'm not a student

Thanks for your help

Last edited by a moderator: