🤔 relativity sword
- in Legend of Vox Machina S02E10 (and E11), Sanlan is given a magic dagger that can be set to hold its position in place
- it is shown doing this in two situation
- above Sanlan, in bed, causing him to cut himself to get out
- inside of a dragon's intestines, such that it impales the dragon if the dragon tries to take off
- BUT...
- (a) what is the dagger fix in place relative to?
- (b) how much force would it take to move the dagger?
- re: (a) what is the dagger fix in place relative to?
- the dagger doesn't seem like it's moving, but the planet is moving, so the dagger is moving (unless in the LoVM universe, the planet doesn't move)
- (1) is the dagger fixed in place wrt the earth?
- thus, if one were on a fast moving vehicle, upon "fixing", it would "shoot" in the other direction
- if one were falling, could one "fix" it, and stay hanging in mid-air?
- (2) is it fixed in place wrt to the position of the bearer at time of "fixing"?
- if one were on a moving vehicle, it would maintain momentum, and keep its position
- but if the vehicle turns or accelerate? what then?
- could we create a perpetual motion device / engine?
- go on a merry-go-round, while spinning "fix" the dagger, so that it rotates with you
- get off and stop the merry-go-around, the dagger presumably continues rotating, free energy!