Occupational Therapy Soapnote

ACTIVITY 4: FUNDAMENTAL PRINCIPLE OF HYDROSTATIC

already said Archimedes: "A body immersed in a fluid experiences a vertical and upward thrust equal to the weight of the volume of fluid evacuated." Normally
us learn by heart and in many cases we fail to understand the principle not to make a comprehensive reading of text sentences. The implications of this principle are profound, and we will unravel it, is there anything more beautiful than to come to the knowledge of the principles and laws of physics through understanding? And to achieve this understanding, what better way than through experimentation.

But before you start ... Have you read Chapter 1 of the book to read? Thus responding to following questionnaire (remember that this part is a single task and do not forget to send him to the end) :

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From here it is a task to be performed by all team members blog. With the data, calculations, videos, graphics, etc generaréis a new entry in your blog that will be common for everyone s taxpayers. For organizational reasons aesthetic while we recommend that you use the equation editor including online or Writer. Do the equation, formula you give to show you just have to save as an image. If you use Excel or any table you want to backup something on the screen and then put it on the blog, I recommend the MWSnap used to make screenshots. Always keep the images. Jpg and thus avoid problems when uploading.
also recommend that you enrich the entry with pictures, videos, links and everything you can think of that might make it more interesting. In particular we give you the right to reproduce our images in your entries so that all who read them know where they come from the data. Remember that it is doing something with a format as away from possible answers as if it were a questionnaire. Give a separate entity.

The following experiment we present is beautiful in its simplicity.

First observe the following images as tools we use:

dynamometer, balance and size.













1. Describe its characteristics. Pay special attention to the difference between precision and accuracy. Could you say what the accuracy of each device? (Save images in your computer so that you can see in a larger size)

For this you can be based on point 4 of the textbook (page 12) and the links you have at your disposal in Section 5.4 of Moodle.

2. What are the units in which they measured the weight, mass and volume? Which ones are fundamental values \u200b\u200band how / what are derivatives? Expresses the dimensional equation in / the case / s may be appropriate.
To better understand the concept of unity and the International System of Units (SI) should read you the paragraph 1 (pages 8 and 9) of your textbook and view the websites that you have access to in paragraph 5.1 of Moodle.

Now we raise the problem: we have two metal spheres of different densities but the same volume and weigh them first,


As you can see the silver dial has a mass of 68.5 g while black dial has a mass of 22.5 g. Then suspend

both areas of a dynamometer by means of a rope, which we consider negligible mass, and we take as indicated in Newtons (remember that if you save you can see them bigger)
The left image in both cases (Black dial and silver dial) is a general view of the assembly and the one on the right is a more short to make the measurement. Note that the dynamometer can measure a maximum of Newton after each subdivision worth 0.02 Newtons.

3. Before proceeding with the calculations must read sections 2 and 3 of textbook (pages 9 and 10) and consult the websites that you have at your disposal in Sections 5.2 and 5.3 of the platform.
then calculate the mass of the spheres using the equation for the weight W = mg (take g = 9.8 m / s ^ 2. Pay attention to the significant figures utilizais, using scientific notation, rounded properly. The entry must show all calculations you to realize and their development (not just the results) Compare the data obtained with the scale marks, is there a discrepancy in the results? At what may be due the differences?

With a size we measured the diameter of both areas as can be seen in the images (remember that you can keep and expand) the result is the same but what is the value in cm? Learn to make measurements with the caliber here .

4. Already you have the diameter measurements of both areas? Needless to say, then you will calculate the volume of these, and finally with the experimental data of the mass obtained in section 2 we can calculate the density of each sphere (d = m / V) Remember that you present the complete calculations respecting the rules for significant figures, using scientific notation and applying the correct rounding.
In a display of research effort possible to find materials that correspond with the densities obtained.

5. We go with the hardest part but first listen carefully to the video that follows:

is easy to deduce the push (click on drive), in Newtons, for both areas if we consider that the thrust is the force "vertical and up" that has made the dynamometer in both cases mark a lower value. To better understand the concept would do the experiences proposals and put together your conclusions (not to be included in the entry)

Note down the values \u200b\u200bobserved in the video (mind you in the book because I made some error with decimals)

These two numbers you got are the experimental values \u200b\u200bof thrust but every good scientist should compare the results with theoretical predictions. Calculate the theoretical value of the thrust areas for both knowing that the density of water is 1 g/cm3. The answer lies in understanding the principle of Archimedes .

Compare the results with the experimental values \u200b\u200band try to explain the discrepancies if any.

Finally, it is always advisable, both from an aesthetic and formal, definitive conclusions.

tickets should be be published in your blog on Monday 7 March.