Sunday, April 25, 2010

Photo Project: Unifrom Circular Motion

This picture is an example of Uniform Circular motion. The object you see, the tie, is moving with the fan in a circle. The tie is moving around the circumference the fan, as it spins. The amount of full revolution the tie makes in a certain amount of time is called the frequency. The frequency is measured in Hertz.
To find the frequency, at which the tie spins, you have to divide the amount or revolutions by the amount of time it took to complete set amount of revolutions.

The tie does not have a constant velocity because it is continuously changing direction, so the tie is accelerating. This type of acceleration is called centripetal acceleration. The tie stays tangential to the circle formed as the fan spins.
To find the centripetal acceleration you must find the velocity, at which the tie spins around the circle, and divide that by the radius of the circle that is made as the fan spins.

The inward force that keeps the fan spinning and the tie, moving in a circle, is called the centripetal force. Without the centripetal force circular motion cannot occur, but it is not a specific type of force, in fact it is provided by the force that keeps the object tie in the circle. The centripetal force requirement is the force that keeps the tie moving in a circle. In this case it is a tension force that keeps the tie and the fan blades from flying off.


  1. Hi Daniel,

    Thanks for your picture and explanation--

    I'm really interested in your process in selecting and creating your project-- you had a choice in the selection of the topic, is that right? If it is, how and why did you come to choose uniform circular motion? Was it a topic that had been difficult for you/ or easy? Then once you had your topic, how did you decide on your great image?

    Hope you don't mind these questions on how you learned,


  2. Daniel you did a good job with your picture. I wish the tie could have been more explicit in the picture.
    Your physics explanation is correct and complete.
    Please be more mindful with your spelling. The posting should say Uniform not unifrom.