- #1
swampwiz
- 571
- 83
The use of the terms "speed" & "velocity"
This is a interesting topic concerning when to use these two terms in a discussion. Of course, if it is a vector term, then velocity must be used - however even for a scalar term, velocity could still be used.
It seems to me that aside from the term of the speed of wave propagation (e.g., the speed of light, the speed of sound, etc.), or the measurement of the speed itself (although that measurement would simply give the velocity of that object), then the term velocity should be preferred - even if it is a scalar or applies to only one length dimension, including angular velocity for a planar system. With that said, I could still see speed used instead if talking about the motion of an object subject to set of holonomic constraints - e.g., a car on a roller coaster, or a point on a rotating wheel. etc. I could also see speed used in the term "instantaneous speed", even though it actually represents a vector quantity (in which case the speed would only represent the magnitude.) And of course in any talk about speed when really it means an inverse of the time required (e.g., computer speed, etc.) - rather than the proper parameter of the time derivative of the displacement in space - should only use speed.
I was wondering what the consensus in the physics community is about this/
This is a interesting topic concerning when to use these two terms in a discussion. Of course, if it is a vector term, then velocity must be used - however even for a scalar term, velocity could still be used.
It seems to me that aside from the term of the speed of wave propagation (e.g., the speed of light, the speed of sound, etc.), or the measurement of the speed itself (although that measurement would simply give the velocity of that object), then the term velocity should be preferred - even if it is a scalar or applies to only one length dimension, including angular velocity for a planar system. With that said, I could still see speed used instead if talking about the motion of an object subject to set of holonomic constraints - e.g., a car on a roller coaster, or a point on a rotating wheel. etc. I could also see speed used in the term "instantaneous speed", even though it actually represents a vector quantity (in which case the speed would only represent the magnitude.) And of course in any talk about speed when really it means an inverse of the time required (e.g., computer speed, etc.) - rather than the proper parameter of the time derivative of the displacement in space - should only use speed.
I was wondering what the consensus in the physics community is about this/