Experiment
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Experiment to Investigate the Relationship Between Factors Affecting
Uniform Circular Motion
Class________________
Name_______________
Aim:
1. Investigate the relationship between the speed and the radius when the centripetal force is
constant.
2. Investigate the relationship between speed and centripetal force for an object in uniform circular
motion with a certain radius.
Equipment:
Centripetal force apparatus
Weight hanger (to act as the weights)
Mass (a steel ball)
Meter rule
Stop watch
Method:
Write a description of what you did here. Try to be as detailed as possible.
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Results:
Test 1: Exploring the relationship between velocity squared v2 and radius (constant FC).
Mass of Weight
hanger
/kg Centripetal
Force
/N Mass of
steel ball
/kg Time for
25 revs
/s Time for
1 rev
/s Radius
/m Velocity
/ms-1 v2
/m2s-2
Test 2: Exploring the relationship between velocity squared v2 and centripetal force (constant
radius).
Mass of
weight
hanger
/kg
Centripetal
Force
/N Mass of
steel ball
/kg Time for
25 revs
/s Time for
1 rev
/s Radius
/m Velocity
/ms-1 v2
/m2s-2
Data analysis:
If you finish test 1, now draw a graph of Velocity squared v2 (y) against Radius (r).
If you finish test 2, now draw a graph of Velocity squared v2 (y) against Centripetal Force (x).
If you finish both the two tests, please plot these on the same graph.
Conclusion:
Make sure to include the science we have learnt and how it relates to your graph and results.
Describe the shape of the gradient and what that means. Quote specific results that have a
significant pattern.
Test 1: What can you say about the relationship between speed squared and radius, from your graph.
Does this prove what we already know about uniform circular motion?
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Test 2: What can you say about the relationship between speed squared and centripetal force, from
your graph. Does this prove what we already know about uniform circular motion?
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Evaluation:
> Do you think your results are reliable? Are you confident that your results are accurate enough?
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> Was there anything about this experiment that makes you feel less confident about your accuracy.
If so, what was it and how do you think it affected your results?
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> If you did this experiment again how would you make it more reliable / more accurate than this
method?
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