Homework

1. With your partner, think of as many examples of inclined planes as you can. Record your list. 2. Select a length for the inclined plane. · Record the length, height, effort force and indicate whether or not it was successful. · Repeat using various lengths.
 * Stairs, van ramp, yard ramp, ladder, escalator, bridges, car ramp, curve ramp. **
 * Lab Instruction:**


 * Table 1: Inclined Plane**

4.68 || 315 || yes || 2.75 || 537 || no || 4.76 || 310 || Yes || 3.16 || 467 || No || 3.75 || 394 || Yes || 3.39 || 435 || yes || 2.26 || 652 || no ||
 * Inclined Plane Length (m)** ||
 * Effort Force**
 * (newtons)** ||
 * Success** ||
 * Success** ||

3. From your chart of data, find the maximum effort our crew member can sustain to pull the stone up the inclined plane. · What is the length of this inclined plane? 4. Would this be the ideal length to use for the inclined plane? 5. What other factors might you consider? 6. Defend your choice for the ideal length. __Give your reasons in complete sentences.__ My choice is rough. So, it would be easy to go up, because their would be more friction. But I don’t much rough surface.
 * The length is 3.39**
 * Yes, it would be the ideal length to use for the inclined plane**
 * I would consider a rough surface, long ramp. I need a a bit rought surface, so, it would be easy.**

7. Transfer the data for length and effort from Table 1 onto Table 2.

8. Calculate the amount of work done to get the stone to the top of each inclined plane. **// Remember: Work = Force applied X distance mass is moved. //**


 * Table 2: Determining the Work done for the Inclined Plane**
 * Effort Force (N) X Distance (m) = Work Nm (J)**
 * 3,480 N** ||
 * 40 m** ||
 * 139,200 j** ||
 * 315** ||
 * 4.7** ||
 * 1,480.5** ||
 * 537** ||
 * 2.8** ||
 * 1,503.6** ||
 * 310** ||
 * 4.8** ||
 * 1,488.0** ||
 * 467** ||
 * 3.2** ||
 * 1,494.4** ||
 * 394** ||
 * 3.6** ||
 * 1,418.8** ||
 * 435** ||
 * 3.4** ||
 * 1,479.0** ||
 * 652** ||
 * 2.3** ||
 * 1, 499.6** ||
 * 435** ||
 * 3.4** ||
 * 1,479.0** ||
 * 652** ||
 * 2.3** ||
 * 1, 499.6** ||
 * 2.3** ||
 * 1, 499.6** ||

9.How do the values of work found for the various lengths of inclined plane compare? __Use complete sentences in your answer.__

The comparison between the vales of work and the various length is that, the length is the distance that is walk between to places. And the values of the work is that the job don’t when you walked between two places. __//**FRICTION TESTING LAB**//__


 * Title:** Testing force and friction


 * Research Question:** will the mass of the carpet and cork be equal.


 * Hypothesis**: if the masses of the carpet and cork are equal, then the mass of plastic will not be equal because the surface of plastic is soft but the surface of carpet and cork is rough**.**


 * Material:** You will be given three different surfaces, mass and a Newton meter.


 * Material:** You will be given three different surfaces, mass and a Newton meter.


 * Dependant variable:** mass
 * Independent variable:** surfaces
 * Controlled variable:** speed, shape, scale.

1. Draw a Data Table to record the different types of surfaces to be tested and the force needed to pull the block at a constant speed. Note that this data table should be included under the //__Data and Calculation section__//.
 * Procedure:**

2. Place 500 grams in the box with the surface to be tested.

3. Attach your newtonmeter to the block.

4. Using the newtonmeter, try and pull the block along the surface. __Note the force needed to pull the block at a constant speed and record in your Data Table.__

5. Repeat steps 2-4 for the other different surfaces.

Data table:


 * Surfaces || Trial 1 || Trial 2 || Trial 3 || Average ||
 * Carpet || 3.5 || 3.0 || 2.5 || 3 ||
 * Cork || 4.0 || 5.0 || 4.0 || 4.4 ||
 * Plastic || 1.5 || 1.0 || .5 || 1 ||


 * Conclusion** – my hypothesis was wrong, carpet and cork masses were not equal. Cork masses was more than carpet. This experiment was tested by the load and the Newton’s. We did three trials for every surface. In this experiment we added load to the surface and we counted the mass by Newton meter. My hypothesis was wrong because cork was more rough than carpet.

Od. my team patners helped me a lot. In this experiment the load worked very well. But the Newton meter and the speed, on which we pushed. The Newton meter didn’t worked well because the string, in which we know the newtons, was moving a lot, and it was hard to know how much Newton is it. And the speed also did not worked well because, in the team all of us did trials, so the speed of everyone was different.
 * Limitations of Experimental Design** – my experiment was go


 * Suggestions for Improvement** – in the future experiment, we might make it at same speed, each member of the team will do other surfaces, rather than doing different trial with others.


 * Part II**


 * Research Question:** Will the mass will be affected if we change speed.


 * Hypothesis:** If we change the speed in every trial, then the masses of each trial will be different, because when we increase the speed, the force will be more and the mass will also be more, if we decrease the speed the force will be less and the mass will also be less.


 * Material:** You will be given three different surfaces, mass and a Newton meter.


 * Dependant variable:** amount of friction.
 * Independent variable:** force.
 * Controlled variable:** weight, speed, shape, scale.

1. Draw a second Data Table to record the different weights to be tested and the force needed to pull the block at a constant speed. Note that this data table should be included under the //__Data and Calculation section__//.
 * Procedure:**

2. Place 200 grams on the block with the surface to be tested.

3. Attach your Newton meter to the block.

4. Using the Newton meter, try and pull the block along the surface. __Note the force needed to pull the block at a constant speed and record in your second Data Table.__

5. Repeat steps 2-4, placing different weights on the block.

6. Draw an x-y graph showing how the weight placed on the block affects the pulling force in newtons. Note that this graph should be included in the //__Results and Analysis section__//.


 * Mass || Trail 1 || Trial 2 || Trial 3 || Average ||
 * 200 m || 2.0 m || 2.0 m || 1.6 m || 1.87 ||
 * 1000 m || 7.0 m || 7.5 m || 8.0 m || 7.5 ||
 * 100 m || 1.0 m || 1.5 m || 1.5 m || 1.34 ||


 * Conclusion** – my hypothesis was right, the mass changed when the speed was changed. This experiment was tested by the load and the Newton’s. We did three trials for every mass. In this experiment we added different load to the same surface and we counted the mass by Newton meter. My hypothesis was right because the mass changed when the speed was changed.


 * Limitations of Experimental Design** – in this experiment we changed the masses but the surfaces were same. We kept carpet as the same surface. The speed especially worked well, because I said too every member to change speed. But the Newton meter again did not worked well because, because the string, in which we know the newtons, was moving a lot, and it was hard to know how much Newton is it.


 * Suggestions for Improvement** – in the future, I will make my eye’s sharp, so that I can see what are the Newton. And from next time I might make the speed same.

=__**" Mr. Davis, i finished my friction testing lab, by tom i will finish the lever lab"**__=