Which of the following statements best defines uniform circular motion?
Motion along a circular path with constant speed and changing direction of velocity.
Speed is a scalar (magnitude only) while velocity is a vector (magnitude and direction). Uniform speed does not imply uniform velocity.
In uniform circular motion the particle moves along a circular path covering equal arc lengths in equal times, so its speed is constant.
However, the direction of the velocity vector is always tangent to the circle, so it changes continuously as the particle goes round.
Because the velocity vector is changing, the motion has a non-zero centripetal acceleration directed toward the centre of the circle.
Hence, uniform circular motion is motion along a circular path with constant speed and changing direction of velocity.
Similar Questions
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Important Questions from Motion in a Straight Line
- Which of the following examples represents motion along a straight line?
Ram records the odometer readings of his car for the distance covered from 2000 km at the start of his journey and 2400 km at the end of the journey after 8 hours. What is the average speed of the car?
A body moves along a straight line with displacement \(s = 4t^2 + 2ts =4t^2+2ts=4t^2+2t\) (in m, t in s). Its instantaneous acceleration is:
The area under a velocity-time graph between two instants represents:
A body is dropped freely from a height 'X' m. If tit takes Y seconds to reach the ground. The time it takes to reach half of the height of the tower is (Take g = 10m/s2)
