We all know the pictures of the astronauts on the ISS floating around. We also suspect that a lack of gravity is bad for the body as the muscles go weak and such.
Why don’t spaceships just rotate to cause the effect of artificial gravity through centrifugal forces?
As some have already mentioned - coriolis forces. But why not build bigger so coriolis forces aren’t an issue? Because spinning up anything of sufficient diameter to even come close to 1G would need some kind of unobtainium to be strong enough to keep the spinning object intact. Say 5 tons of mass at 0 G is just mass, but now accelerate it and you need to figure out how to support 5 tons.
1 rpm for 1 G is going to need almost 1km radius. 2 rpm is ~400m.
You can see that the numbers, size, and engineering get pretty ridiculous to keep people from being sick when spun.