Earlier last month, the Journal of Experimental Biology published a study about fingerprints and that there is new doubt that fingerprints increase friction, which supposedly facilitates the grip by our hands. Now, they are saying that fingerprints actually reduce the amount of friction between the skin and other surfaces. This is probably contrary to everyone’s intuition.
According [...]
EDITOR’S NOTE: Welcome to today’s guest writer, Stephen.
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Helicopters are fascinating creatures. One of their distinguishing features is their ability to hover in place. This is essentially accomplished through a torque and force balance. For the forces we must look at Newton’s second law of motion:
Notice the arrows on top of the force and acceleration terms. [...]
Elevators are contraptions made for convenience, especially for people who travel several floors at a time inside a tall building. You may have noticed that it feels no different inside an elevator in the middle of its journey up or down than it feels to be standing on a stationary ground (one that is not [...]