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In case of uniform circular motion, the acceleration is

  • A.Variable in magnitude but constant in direction
  • B.Constant in magnitude and directed radially inwards
  • C.Variable in magnitude but tangential to the circle
  • D.Zero

Answer: A

The acceleration is constant in magnitude and directed radially inwards.

In uniform circular motion the speed does not change, so the magnitude \[a = \frac{v^2}{r}\] is fixed, but the direction always points at the centre and therefore turns with the body. It is constant in size and variable in direction - the reverse of what one might guess.

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