What is velocity ? :)

Question

anonymous · Answer

The rate of change of speed?

anonymous · Answer

the speed of something in a given direction

***[isuru]*** · Answer

nope

anonymous · Answer

also velocity = distance divided by time

anonymous · Answer

velocity is velocity

***[isuru]*** · Answer

velocity is the rate of change of displacement

***[isuru]*** · Answer

velocity is a vector quantity... so it has a direction as well as a magnitude

anonymous · Answer

thank you guys :)

***[isuru]*** · Answer

speed is the rate of change of distance

anonymous · Answer

Average velocity  -  The time-average of the velocity function over a specified time-interval.

compassionate · Answer

Acceleration is the rate of change and speed. 
Velocity is a vector; not a scalar. Velocity means directional e.g., North or South, and magnitude. 

E.g., the 2,000 lbs cargo truck was travel North-West at 75 MPH.

***[isuru]*** · Answer

distance is a scalar  quantity.. so it only has a magnitude.. hence speed also has only a magnitude which means  speed is also a scalar quantity

***[isuru]*** · Answer

whenever u talk about velocity u have to conciser both direction and magnitude
                    hence u can't define velocity using speed or as rate of change of distence

***[isuru]*** · Answer

@Compassionate  I think acceleration is more suitable to define as 
          rate of change of velocity than rate of change of speed

compassionate · Answer

No. Acceleration doesn't need a direction. It is not the rate of change in velocity. Acceleration is a scalar and velocity is a vector. 

>He accelerated at 10 mph every 5 minutes. 

Velocity correlates magnitude and direction. 

>He accelerated 10 mph every 5 minutes, while traveling 20 MPH; North-South.

***[isuru]*** · Answer

nope

ash2326 · Answer

@Compassionate Acceleration is a vector quantity, it'd be meaningful to understand in which direction acceleration is applied. A plane flying is always under the acceleration due to gravity acting downwards.

***[isuru]*** · Answer

acceleration  is a vector quantity for sure

ash2326 · Answer

But the acceleration is not in the same direction as the velocity in this case.  We have to explicitly mention the direction to make sense.

***[isuru]*** · Answer

the best example is.. have u ever drawn a graph to represent the vertical component of velocity in a projectile motion under gravitational acceleration ?

compassionate · Answer

Well - I'm all for flipflopping semantics, and I may be wrong; but I actually have some work I need to attend to. Best of luck, guys.

agent0smith · Answer

It's not semantics at all @Compassionate, it's required... if acceleration were not a vector, explaining something like circular motion would be very difficult, where the acceleration is perpendicular to velocity.

compassionate · Answer

When you're a nihilist; everything is semantics.

ash2326 · Answer

I think you're being heretic @Compassionate

agent0smith · Answer

Plus acceleration doesn't have to right angles, or parallel, to velocity... it could be at an angle. eg velocity is currently North, but acceleration is north-west, or something like 12 degrees north of east... it definitely requires direction, as it's not always parallel to v (like it is with a car speeding up or slowing down in a straight line)