Circular motion - Edexcel Past Question (Jan 2010)

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SUMMARY

The discussion centers on solving a circular motion problem from the Edexcel Past Question (January 2010), specifically determining the radius of a track given a speed of 57 m/s. The user correctly applies the centripetal force equation, resulting in a radius calculation of 100 meters. The confusion arises from the need for an angle in the free body diagram, which is not provided. However, the calculations confirm that the radius is indeed 100 meters based on the given parameters.

PREREQUISITES
  • Understanding of centripetal force and its application in circular motion
  • Familiarity with free body diagrams and force components
  • Knowledge of basic physics equations related to motion, specifically F = mv²/r
  • Ability to interpret and solve past exam questions in physics
NEXT STEPS
  • Review the principles of centripetal acceleration and its calculations
  • Study free body diagram techniques for analyzing forces in circular motion
  • Practice solving additional Edexcel past questions on circular motion
  • Explore the relationship between speed, radius, and centripetal force in various scenarios
USEFUL FOR

Students preparing for Edexcel physics exams, educators teaching circular motion concepts, and anyone seeking to enhance their understanding of dynamics in physics.

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Homework Statement



I have attached the question that is troubling me including all relevant previous bits of the question along with their answers.

So the question asks me to show the radius of the track is 100m


Homework Equations





The Attempt at a Solution


Obviously I draw a free body diagram with Fnormal vertically upward (as stated) and Fmg vertically downward. The centripetal force acts at a diagonal angle and is hence made by the vertical component force.
to do this calculation I need to know an angle but I don't have one??

The MS calculation is:
4mg - mg (3mg) = mv2/r
hence r = 100m (we have been told the speed is 57 ms-1)
I don't see though how this is correct
please can someone help me
thanks
 

Attachments

Physics news on Phys.org
I too think that is correct. I just solved it and got the same answer. Where is the problem?
 

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