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Side profiles of some unsupported and supported breasts

For now, let’s concentrate the forces the boobs put on the bra at the nipple, to make them easier to analyse. We will also only consider external forces for now – i.e. how the bra as a whole works as a support device. In the extended version of this post, we will consider a simple 2D shape representing the structure of a bra, so we can discuss the distribution of forces a bit more in depth, so check that out if you’re interested.

Source: The Physics of a Supportive Bra Explained