It’s a little thing for a newspaper, but it did take two thousand years for physicists to figure it out, that is, that forces act only in straight lines.

The diagram is from an article on GM’s failure to recall cars with a dangerous defect, responsible for at least 13 deaths, that unexpectedly turned the ignition off.

I suppose the weight of the key ring, shown as a vertical force vector, causes the key to rotate in the lock, but the motion is rotational, not the force.


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