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# Mechanics watch

1. Does speed/velocity momentarily become zero for any change of direction or is it only when the change of direction is in exactly the opposite direction?
2. Only when the change is in exactly the opposite direction.
3. (Original post by Economist2001)
Only when the change is in exactly the opposite direction.
Is speed/velocity reduced for any change of direction?
4. No.

think of motion at constant speed in a circle.

In practice of course we tend to slow down to take a corner, be it in a car, on a bike, whatever. (But that's to do with friction, radius of curvature and centripetal force, so probably for another thread )
5. (Original post by G.Y)
Is speed/velocity reduced for any change of direction?
Velocity is a vector so any change in direction is necessarily a change in velocity.

Speed is a scalar

TBH this should have been drilled in at GCSE
https://www.bbc.co.uk/education/guid...tfr/revision/6
6. Speed becomes zero where there are no metres moved per second (so when no distance changes)

Velocity becomes negative if you’re moving away from the positive start direction
7. (Original post by G.Y)
Is speed/velocity reduced for any change of direction?
Speed is directionless it is a scalar. The velocity would change in direction (angle) but not in Magnitude.

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