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Home Q & A Board Science-Related Homework Help Physics
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Bugbaja Bugbaja
wrote...
Posts: 74
Rep: 2 0
11 years ago
And also,
how can a particle have a non-zero acceleration without having varying speed?
Thanks so much Randy
Thanks akm
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wrote...
#1
11 years ago
Velocity is speed and direction. If the direction is changing, the velocity is changing whether or not the speed is changing.

Same answer to the second question. If velocity is changing, that's an acceleration, even if speed is not changing. And a change in direction is a change in velocity.
wrote...
#2
11 years ago
(i) circular motion with constant speed=>direction of velocity continuously changing=>velocity changing continuously
(ii)circular motion with constant speed=>direction of velocity continuously changing=>velocity changing continuously=>non - zero acceleration
wrote...
#3
11 years ago
Yes. if it is only changing its direction.
A simple example is a circular motion at constant speed which has an acceleration = V^2/r
wrote...
#4
11 years ago
simone,i think u have some idea about vectors and scalars.velocity-speed.the difference between these two is velocity is the change in displacement.here both the magnitude(eg:20mts) and direction are represented.as we move to speed it represents only the magnitude.so as we vary the direction but not magnitude. the velocity changes but speed remains constant as we are not changing the magnitude(say it length). in the same was,change in velocity is acceleration.so acceleration does not depend on speed.bye!
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