Recent content by onder

Now it makes a lot of sense to me (especially for the "first motion, static"). Once the object starts moving, now, depending on the velocity vector of each infinitesimal elements, the friction force is going to be the kinetic friction force acting towards the opposite direction of the velocity...

Thanks a lot, haruspex! That was a great thread for me. For the defined s above, the moment of the applied force is going to be (-s x F). I will figure out where the s is. It seems like it will be the CM for the whole motion but I am not sure. At least for the first motion, it should be CM...

Thanks! I have already implemented a numerical approach to solve that and found the frictional force distribution on infinitesimal elements. I just don't know where the pivotting point is. Could you define what is the pivotting point in this case?

Exactly, so the question is, where should be the pivoting point for the rotation?

Thanks, guys! I like simplifying, so let's focus on this simplified case. I am just thinking in terms of "first motion" which is when it just starts to rotate. It is still complicated to me because I am not sure what the friction distribution should be. Once we apply the force, there should also...

Ah, now it is clear! I was looking from the object's coordinate frame! So basically, the point r at your derivation is the location where |v|=0 at the global frame. Would the following statement be true then: could we say the center of rotation coincides with the center of mass if the global...

Thanks a lot for your answer! I have 1 objection to this, we are assuming the center of mass would go with the velocity v=p/m and also we say there is a rotational speed ω around ##r=\frac{x^2+y^2}{3x}## . In this case, due the rotation of the robot, which is not at the center of mass, the...

Thank you! Could we say this point P is actually the center of mass of the object or could it be something else? It is a pretty easy question when there is a hinge or a fixed point. But it was a little complicated to me once I start to think this issue for a free body on a surface :)

Hi guys, I was wondering if it is possible to have a pure planar rotation of a rectangular-prism shaped rigid body on a planar surface when it is subjected to a planar point force at the tip. Is there any range for the point force such that it can not break the static friction force (so no...