how many forces act on lizard when crawling on roof
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! That’s actually a great question, one for which I don’t have a definite answer. In this case, I would expect the VDW forces to be due to the existing covalent bonds within the setae rather than the temporary ones solely due to revolving electrons. However, it remains true that the forces could be repellant instead of attractive; regarding this, I can only speculate that perhaps their feet are “calibrated” to stick to either a positively or a negatively charged surface and when the surface is of the opposite charge they are unable to stick to it. Another possible explanation would be that with the sheer number of setae on their feet, the net effect is attractive although if it were purely by chance it should be 50% attractive and 50% repulsive leading to a net neutral force…
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