Like what difference does the cutting motion do compared to just pushing down a knife ?
In: Physics
Knives aren’t perfectly smooth. If you look at a knife edge under a microscope, you’ll notice it’s serrated, like a saw blade. The sharper the knife, the smaller the ‘teeth’, but they’re always there. In short, the reason you use a sawing motion is because knives are still saws, just on a smaller scale.
That said, if you’re finding you need to be sawing through everything, consider sharpening your knife. A proper whetstone gives the best results, but even a pull through sharpener can massively help reduce the amount of effort you need to expend in order to cut things.
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