What is the difference between speed and velocity?

The difference is a bit subtle. Velocity is speed in a particular direction.

So, for example, a car travelling at 50 miles per hour round a bend is travelling at constant speed. Its direction is changing, however, so its velocity is also changing.

Velocity is always measured from a single point. So an object traveling in a circle has velocity zero relative to the centre of the circle, since the distance from the centre to the object is constant..

Jan K. GCSE Maths tutor, A Level Maths tutor, GCSE Physics tutor, A L...

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