Homework+Feb+28++2010


 * Title** : its to show how many Newton does it need to pull the forces.


 * Research question** : How does surface and weight affect the size of the friction and force?


 * Hypothesis** : if an object has more friction then it well take more force to move the cork because its hard.

Meter Newton meter Weights Surfaces: **__if the surface causes more friction then the sliding will be much harder and stronger because the friction is a resistance to force, it will require more force move it.__**
 * Material** :

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:**
 * Part I**

2. Place _______ 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.

//__Hythopisis : if you put more weight then there well be more friction forces needed.__//

1 || 2 || 3 || average || carpet || 1.9 || 1.8 || 1.6 || 1.7 || cork || 2.8 || 2.7 || 2.6 || 2.7 || plastic 1 || 1.0 || 0.8 || 1.0 || 1.0 ||

1 || 2 || 3 || average || carpet || 0.7 || 1.0 || 0.5 || 0.7 || cork || 1.5 || 1.6 || 1.7 || 1.6 || plastic 1 || 0.7 || 0.5 || 0.5 || 0.6 ||

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-

Carpet || 1 || 2 || 3 || average || 1000 || 2.8 || 2.6 || 2.3 || 2.5 || 400 || 1.2 || 1.3 || 1.3 || 1.3 || 200 || 0.4 || 0.7 || 0.4 || 0.5 ||


 * Conclusion**: the weight is reactive with the force and friction because the weight and surface is an important part of friction and force.


 * Reflection**: trying more weights and do it more times with other samples which make you understand it more and more because the repeating is good for understanding the experiment.