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The aim of this experiment is to investigate the patterns of circular motion using a rubber bung tied to the end of some fishing wire.

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Introduction

GCSE Physics Investigation on Circular Motion.

Ashav Norda

11BP

Title: Investigating Circular Motion

Aim:

The aim of this experiment is to investigate the patterns of circular motion using a rubber bung tied to the end of some fishing wire.

Background Information:

Newton's first law of motion says that an object's inertia will keep it from changing its speed and/or direction unless some force acts on it. This means that satellites orbiting the Earth must be feeling some force that constantly deflects them toward the centre of the Earth. If there was no force, they would travel in a straight line at a constant speed.

If you whirl a ball attached to string around your head, it moves in a circular path around you because the string is always pulling the ball directly toward the hand grabbing the string. The ball wants to move in a straight line and the string is pulling it directly inward. The resulting deflection is a compromise: a circular path. The string is applying a centripetal force to the ball: an inward force.

...read more.

Middle

To Ensure a Fair Test:
  1. Make sure that the diameter of the fishing wire is constantly 63mm.
  2. Place the right weights on the fishing wire, to add up correctly.
  3. Make accurate calculations to at least 2 decimal places.

Apparatus List

  1. Ruler
  1. Bung
  1. 50 gram weights
  1. Fishing Wire
  1. Plastic Tube
  1. Timer
  1. Crocodile Clips.

Diagram:

image01.png

Results from Preliminary Work

From the experiment I can say that I am going to investigate measuring different size radii.

Here are my results.

Radius/cm

Time taken to complete 20 revolutions / secs

100

11

125

8

150

7

175

6

200

6

225

5

...read more.

Conclusion

Now swing the bung and time how long it takes to complete 20 revolutions. Record results on a results table. Repeat for precision. This is because if you have a multiple set of results, you can also cross-refer with them, and can interpret which set of results are more reliable.

We had to use certain apparatus for this experiment; it is all listed below in the apparatus list.

Safety:

  1. Wear safety goggles, otherwise the bung can take ones eye out.

To Ensure a Fair Test:

  1. Make sure that the diameter of the fishing wire is constantly 63mm.
  2. Place the right weights on the fishing wire, to add up correctly.
  3. Make accurate calculations to at least 2 decimal places.

Apparatus List

  1. Ruler
  1. Bung
  1. 50 gram weights
  1. Fishing Wire
  1. Plastic Tube
  1. Timer
  1. Crocodile Clips.

Diagram:

image01.png

Prediction: I have learnt that as the radius of the thread increases the speed or time that is taken for the bung to move in 20 revolutions is faster than that with a smaller radius.

...read more.

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