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M1 moments help

Why is it that 'if the rod is about to turn about D then there is no contact force at C'?
See attached photo
ThanksImageUploadedByStudent Room1439125495.309728.jpg


Posted from TSR Mobile
If it's turning about D, yep there's no reaction force at C

Edit: just saw the 'Why?" It's because it's going to move about D upwards. Therefore the force at the support C must be zero, it will no longer affect the rod as it goes to move.
(edited 8 years ago)
Original post by SarahLund
If it's turning about D, yep there's no reaction force at C

Edit: just saw the 'Why?" It's because it's going to move about D upwards. Therefore the force at the support C must be zero, it will no longer affect the rod as it goes to move.


So basically the rod is no longer resting on C at that instant so there is no force from the rod acting on C, so there will be no normal reaction acting upwards at C?
Is reaction force the same as normal reaction?


Posted from TSR Mobile
Original post by anoymous1111
So basically the rod is no longer resting on C at that instant so there is no force from the rod acting on C, so there will be no normal reaction acting upwards at C?
Is reaction force the same as normal reaction?


Posted from TSR Mobile


The rod is still resting, but it is about to no longer be resting on C. My teacher had me think of it as no longer being on C, because it is about to move away from it so there will be no normal reaction.

Yeah, the reaction force at C is the normal reaction :smile:

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