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Uniform Circular Motion (UCM)

Uniform Circular Motion (UCM). J Pemberton. What is Uniform Circular Motion?. Motion in a circle! The speed remains constant Open the following website and get the animation going by choosing the RUN NOW button http://phet.colorado.edu/simulations/sims.php?sim=Motion_in_2D

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Uniform Circular Motion (UCM)

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  1. Uniform Circular Motion(UCM) J Pemberton

  2. What is Uniform Circular Motion? • Motion in a circle! • The speed remains constant • Open the following website and get the animation going by choosing the RUN NOW button • http://phet.colorado.edu/simulations/sims.php?sim=Motion_in_2D • UCM This the main example of an object changing direction without its speed changing. • Is an object going in a circle accelerating?

  3. With the PHET simulation active watch the Video then try it yourself http://pembyphysics.wikispaces.com/experiment

  4. What is the reason the acceleration is towards the centre of a circle? • At time 1 the object might be at the top of this circle

  5. What is the reason the acceleration is towards the centre of a circle? • At time 2 the object might be little further to the left.

  6. What is the reason the acceleration is towards the centre of a circle? • Lets look at the two velocity vectors u v

  7. We need to subtract u from v • v-u u v

  8. This means adding the reverse of u • v-u u v v v-u -u

  9. Note that the v-u vector is pointing towards the centre of the circle. • v-u u v v v-u -u

  10. What are the important variables of circular motion? • Period (T) • Frequency (1/T) • Radius(r) • Speed (v) • Acceleration (a) • Net Force (Centripital Force)

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