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## Main Question or Discussion Point

Hi,

I've been reading about four-vectors and I have two quick questions:

If the position 4-vector is timelike, are the corresponding momentum and acceleration vectors also timelike? If the position 4-vector is spacelike, are the corresponding momentum and acceleration vectors also spacelike? Why?

Also, I understand the physical meaning of timelike and spacelike

Thanks in advance! :-)

I've been reading about four-vectors and I have two quick questions:

If the position 4-vector is timelike, are the corresponding momentum and acceleration vectors also timelike? If the position 4-vector is spacelike, are the corresponding momentum and acceleration vectors also spacelike? Why?

Also, I understand the physical meaning of timelike and spacelike

*intervals*, i.e. that if an interval between two events is timelike the events can have a causal link. But what's the physical meaning of timelike and spacelike*vectors*?Thanks in advance! :-)