the angle of the guillotine not only change it from a chopping motion to a slicing motion, but increased the cutting surface and increased the cutting speed significantly. Since the blade is at an angle to the cutting surface the cutting edge will pass through the object at a much faster rate then if the blade was parallel.
Because Science did an episode that explains very well. 8:25 showing that the cutting edge of a guillotine moves much faster than it falling.
[https://youtu.be/YlpiV4suBNA](https://youtu.be/YlpiV4suBNA)
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