You switched off a fan and the fan blades start to slow down. Is the motion of the fan
periodic in this case? Explain your answer.
Answers
Before answering to your question, I would like to make you recall a theory of physics,Newton’s First Law of Motion. It states that a rigid body at rest stays at rest and a rigid body in motion stays in motion with the same speed and same direction, unless and until an external force is being applied to the rigid body. And this law is also referred to as Law of Inertia.
Now here according to your question, the fan here is the rigid body and the rigid body is in motion when the switch is turned on. When the fan is switched off, here rotational inertia acts upon the rotating fan. And thus due to this rotational inertia the fan rotates,i.e., its blades moves,and will rotate until and unless an external force is being applied. And since there is a frictional force acting upon the rotating blades of the fan due to the air, the speed of the fan blades ceases and ultimately comes to halt. Thus here, air friction is the external force which makes the fan blades to stop after sometime, otherwise it would have never stopped rotating : HOPE THIS HELPS !!!
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No, due to the friction between the moving parts the fan cannot execute a periodic motion.
Explanation:
When the power supply to a moving fan is cut-off then its rotational speed continuously slows down and finally comes to rest.
Periodic motion is a motion that repeats itself after a fixed time interval, but here as we know due to internal friction of the moving parts the rotational speed of the fan slows down and hence it cannot be regarded as periodic motion.
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TOPIC: periodic motion
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