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# Centripetal motion experiment. Objective To study the relationship between the angular speed and the centripetal force and verify the expression of centripetal force.

Extracts from this document...

Introduction

School Name：  N.T. Heung Yee Kuk Yuen Long District Secondary School

Name：  Cho Chun Wa               Class No：  6C  (6)

Date：  21-10-09                       Subject：  AL Practical Physics

A4   Centripetal motion

### Objective

To study the relationship between the angular speed and the centripetal force and verify the expression of centripetal force.

Apparatus

 Rubber bung Glass tub Nylon thread Paper clip Paper marker Stop-watch Metre ruler Slotted mas Electronic balance

Precautions and safety measures

• Wear safety spectacles and carry out the experiment in a large space so that the whirling rubber bung will not hit us easily.
• Use nylon spread, which is inextensible to lower the error.

Theory

To keep the body moving in a circle, the centripetal force is required. It is provided by the external resultant force towards the centre. To keep the radius unchange, the cantripetal force should alter the angular speed of the object.

Middle

Repeat the experiment(step1-4) by addind slotted masses to the hanger.

Results and discussion

The rubber bung cannot exactly circle in a horizontal plane because the vertical component has to balance the weight. If the this is exactly horizontal, the vertical component of the tension will be 0N.

The tension T and the weight should be theorectically the same. However, those in table 1 are not the same because of the experimental error. For example, the fan maybe turning on when performing the experiment. There is friction acting on the opening of the glass tube. And the rubber bung cannot be exactly whirled in constant speed and horizomtal plane. Besides, there maybe counting errors of the number of revolutions of the circular orbits made by the rubber bung.

Conclusion

lass="c4">21.6

20.6

21.0

0.700

8.97

1.42

0.122

1.22

22.2

23.2

23.2

22.9

0.763

8.23

1.20

0.102

1.02

25.2

24.8

24.6

24.9

0.830

7.57

1.01

0.0819

0.819

28.4

27.4

28.4

28.1

0.937

6.70

0.797

0.0617

0.617

30.6

31.2

31.2

31.0

1.03

6.10

0.658

Mass of the rubber bung (m) =    0.0221    kg

Length of the nylon thread (l ) =    0.800      m

Table 1

Figure b

Conclusion

From the experiment, we can conclude that the higher the angular speed, the higher the centripetal force. Also, the formula of cenntripetal force=mlω2 can be deduced.

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