laser scope

26 Mar 2009

...
   (in fact, last
time I was asked for my weight, I gave it in newtons. If
 they want to know my mass, they can ask for that!). And 'speed' .vs.
 'veloctiy'.  
     Just for your curiosity, in portuguese "speed" and "velocity" has
the=
 =20
 same meaning - "velocidade". Maybe the correct term for velocity would be=
 =20
 "acelera=E7=E3o" which means "acceleration" in english 
Oh no. Acceleration is a different thing again.

Both speed and velocity are a measure of rate of change of distance. The 
differnce is that speed is a scalar quantity, while velocity is a vector.
In fact speed is the asolute value of the velocity.

An object moving in a circle may have constant speed (meaning it takes 
the same time to cover each centimetre of the circumfernce of that 
circle), but it can't have constant velocity (since the direction of 
motion is changing, the velocity must be changing)

You must have different words for these 2 quantites in Portugese, surely?

Acceleration, at least as used by scientists in England, is also a 
vector, the rate of change of velocity.

-tony

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laser scope