give one example to show that a particle moving with a constant speed may not be having a uniform speed
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Example: A child in a "merry-go-round".
Any particle, if it is in uniform circular motion, has a constant speed but a variable velocity as it's direction is changing. Or, it has an acceleration.
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- Any particle, if it is in circular motion, will receive a force from the centre, known as centripetal force ("centre-seeking" force).
- Planets receive centripetal force through their respective stars.
- C.F. = mv²/r (where a = v²/r).
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