being massive doesn’t prevent an object from moving. Only other forces on an object can do that.
We live in a world where friction is everyhwere. And massive objects often dig into the ground a lot to prevent us from sliding them.
And gravity pulls down on them hard, preventing us from lifting them.
But if you get rid of the other forces (really low friction) you can make anything change it’s motion. Massive things just have a lower acceleration when you push.
So the huge blades are just slow to begin turning, as the bearings remove almost all the friction. And they’re slow to stop turning.
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