Big-Daddy
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Does anyone have a good set of notes or guide for rigid-body equilibrium in M2? The main thing I'm looking for is how to deal with where the forces act on the body, e.g. how to know where the normal reaction acts, friction acts, weight acts etc., and use this to balance moments correctly on that body; and the toppling and sliding conditions.
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brianeverit
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(Original post by Big-Daddy)
Does anyone have a good set of notes or guide for rigid-body equilibrium in M2? The main thing I'm looking for is how to deal with where the forces act on the body, e.g. how to know where the normal reaction acts, friction acts, weight acts etc., and use this to balance moments correctly on that body; and the toppling and sliding conditions.
The weight always acts through the centre of mass. If there is any tendency for the body to rotate about any particular point then the reaction and friction forces will act through that point
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Big-Daddy
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(Original post by brianeverit)
The weight always acts through the centre of mass. If there is any tendency for the body to rotate about any particular point then the reaction and friction forces will act through that point
So if a block on an inclined plane is on the point of toppling, the normal reaction force will act through the point about which the block would topple rather than through the centre of mass of the block, and friction would act through the same point.

How about if the block is on the point of sliding? Where do friction and the normal reaction force act then?
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brianeverit
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(Original post by Big-Daddy)
So if a block on an inclined plane is on the point of toppling, the normal reaction force will act through the point about which the block would topple rather than through the centre of mass of the block, and friction would act through the same point.

How about if the block is on the point of sliding? Where do friction and the normal reaction force act then?
If you are only considering sliding then it doesn't really matter where you take them to act as you would not be taking moments.
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