A Forces on rotating disk object

[StoyanNikolov]

- Is the center of mass initially at rest?

- Is the force a short impulse or does it act over a certain period? If the latter, is the direction of the force constant in the inertial frame or in the rotating disk frame?

- Are there any other forces acting?

If there are no other forces, and it is a short impulse, the center of mass will accelerate in the direction of the force. So if it was initially at rest, that's where it will go.

- The center of mass is initially at rest
(There is only rotational motion of the Disk) .
- The force is brief impulse .
- No other forces (only mentioned in the attached picture)

 

[StoyanNikolov]

Assuming other forces are either absent or negligible, it will move upwards.

Consider the situation in which the disk isn't rotating, but a fast moving object moves upwards and strikes the disk at the point you've circled (or some pegs sticking out, or however you want to apply the force). Assuming the disk is not attached to anything else, the center of mass will move upwards. This is the same situation, just without the rotation, which I don't believe matters at all for your question.

Thank you.

If others also want to give opinion are welcome.

 

[jbriggs444]

If others also want to give opinion are welcome.

Everyone here is in agreement. If an object that is not translating is subject to an net upward external impulse, it will begin translating upward.

However, I think that many of us are harboring a suspicion that you are being intentionally coy and are hiding an important part of the scenario from view.

 

[Vanadium 50]

If others also want to give opinion are welcome.

Um, telling other people what they are and are not welcome to do is more likely to make them angry than anything else.

Further, when discussing rotation, it is not a good idea to use the word "moment" to mean an instant in time.

Now, I count this question being answered no fewer than 8 times - including in a link you yourself provided.. If 8 is not enough, how many more? 15? 32? 64?

 

[StoyanNikolov]

Um, telling other people what they are and are not welcome to do is more likely to make them angry than anything else.

Further, when discussing rotation, it is not a good idea to use the word "moment" to mean an instant in time.

Now,, I count this question being answered no fewer than 8 times - including in a link you yourself provided. If 7 is not enough, how many more? 15? 32? 64?

No. It is polite invitation. If you consider yourself angry , please
don't post on this topic.

 

[Vanadium 50]

please
don't post on this topic.

Telling people not to post on "your" topic is not OK.

 

[russ_watters]

Locked pending more moderation. Don't hold your breath.

 

[Drakkith]

Locked pending more moderation. Don't hold your breath.

Thread will remain locked. Any questions, concerns, or comments about this can be directed towards myself or another mentor via a personal message or the report button.