Like what difference does the cutting motion do compared to just pushing down a knife ?
In: Physics
You could just press down harder. Look at print shops that have a hydrolic cutter that can slice straight down through a hundred sheets at once.
When we cut foods for the most part we are slicing through things that are softer than the blade. Back and forth motion will cause some bunching and that unevenness gives the blade a areas that are higher and more vulnerable. Lay a towel on a table and pretend your hand is a knife, one horizontal move and you have ripples and wrinkles.
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