I was using a concrete diamond cutting cup attached to an angle grinder at work the other day. The disk is heavy-ish (maybe a pound or two). When I turn the power on, it feels as though the thing gains 5 pounds. What is happening?
In: Physics
It doesn’t make it any heavier, but it does make it much harder to rotate. You wouldn’t notice a difference in moving it straight up and down, but any kind of rotating will be more difficult.
If an object is moving in a straight line in one direction, that has no effect on that object moving in a straight line in a different direction. That’s not true with rotating. An object can only rotate in one direction at a time. So when you try to rotate your angle grinder, the fast rotating disc is resisting it.
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