An athlete is running along a circular track with a constant speed of 3 m/s. Which of the following statements in correct?Group of answer choicesacceleration of the athlete is non-zerothe correct answer is not in this listacceleration of the athlete must be zero because the speed is constantnet force on the athlete is zero because no one is pushing himthe track must be frictionless for the athlete to run with a constant speed
Question
An athlete is running along a circular track with a constant speed of 3 m/s. Which of the following statements in correct?Group of answer choicesacceleration of the athlete is non-zerothe correct answer is not in this listacceleration of the athlete must be zero because the speed is constantnet force on the athlete is zero because no one is pushing himthe track must be frictionless for the athlete to run with a constant speed
Solution
The correct answer is "acceleration of the athlete is non-zero".
Here's why:
Even though the athlete is running at a constant speed, he is still accelerating. This is because acceleration is not just about changes in speed, but also changes in direction. Since the athlete is running in a circle, his direction is constantly changing, which means he is accelerating. This is known as centripetal acceleration.
The net force on the athlete is not zero because there is a force acting towards the center of the circle, which is what keeps him moving in a circular path. This force is provided by the friction between his feet and the track.
The track does not have to be frictionless for the athlete to run at a constant speed. In fact, if the track was frictionless, the athlete would not be able to run in a circle at all because there would be no force to keep him moving in that circular path.
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