Whereas a shorter piece of resistance putty can represent a queue at a roundabout. When oil or grease is added, the coefficients drop to about 0. More essays like this: From looking at my graph, it shows the results are neither inversely or directly proportional.
This could be because I was not being accurate enough with having exactly 8cm of resistance putty and having the width exactly the same as with all the other different lengths.
However, in the last several decades an entirely new class of very smooth, lightweight, synthetic materials have been invented and manufactured for a variety of applications. This is very good. This could be done by putting the resistance putty into a water bath and connecting the wires to the putty in this way.
Evaluating The method I used was quite easy to use, except some problems did occur. They should easily be able to find information about what these materials are made of, but it is unlikely they will be able to find out much about how they behave with respect to friction.
However, consider that as long as some surface imperfections are present on one or both surfaces, friction will occur. Lesson Background and Concepts for Teachers The effects of weight and contact area on friction are complicated because there are two major mechanisms of friction at work.
We know that for resistors in series, the total resistance is equal to the sum of all the individual resistors. For example, dry steel on dry steel has a static coefficient of about 0.
Once groups have formulated their hypotheses and explained their reasoning in writinglet them know that they will be able to test their hypotheses using the same basic method they used in the previous lesson.
Even though it is difficult to connect the coins onto the resistance putty whilst trying not to change the width of it, it is still possible to connect the resistance putty into the circuit.
Nevertheless, the similarities and differences between glass and diamond are such that students should be able to come up with some plausible explanations, or hypotheses, especially since they are armed with knowledge about the importance of molecular attractions in smooth-surface friction. Advise students to remember this fact after they get their driving licenses!
Give students some data consisting of the weights and frictional forces measured for several pairs of surfaces, and ask them to calculate the coefficient of friction of each. Example of such hypotheses might be, "When more weight is added to the cup, more friction will be measured when we slide it across the table," or "Weight will not affect the friction measured.
So, I have decided to amend my range from 20cm to 6 cm, to 16cm to 2 cm. The classical view of friction is that it is caused solely by surface irregularities, called "asperities", and that weight correlates directly with the amount of friction that occurs.
This will be true for both static and kinetic friction, although the line for static friction should be a little steeper than the line for kinetic friction. But, even though this problem occurred, I tried to do the experiment in as safe an environment as possible.
Also, all of the resistance readings with one cell are different to the other readings of the same length, as the current reading was not accurate enough. The amount of surface area in contact does not appear in the equations anywhere.
However, do check to see that the explanations they give for their hypotheses are reasonably complete. Despite having nearly one anomalous result and one point on the graph not on the best-fit line, I think I can say my conclusion is more likely to be valid than invalid.
This could be due to the readings constantly fluctuating and the current reading being too small. When using a rheostat, the current has to flow through a longer length of coil and we see that the current is smaller, showing the resistance is larger.
Point out to students that many aspects of friction are still poorly understood and are being researched by scientists and engineers throughout the world.A new study provides insights on the factors that affect health-related quality of life in older adults with cancer.
The findings support the importance of addressing persistent symptoms, managing.
What Factors Affect Movement? Specific Curriculum Outcomes Students will be expected to: • investigate factors that affect movement [GCO 1/3] • propose an answer to an initial question or problem and draw a simple conclusion [GCO 2] • communicate procedures and results.
Title: Investigate the Factors that Affect the Rate of Respiration in Yeast. (Temperature) Aim: The aim of this experiment is to investigate the effect of changing the temperature on the rate of respiration in yeast. For the second example, students might argue that, "Weight will not affect the amount of friction because the same amount of surface on the bottom of the cup will be in contact with the table's surface.
Factors affecting enzyme activity. Enzymes are sophisticated catalysts for biological processes. These practicals (and the practicals at intermediate level) give you opportunities to explore how enzyme activity changes in different conditions.
My task is to investigate the factors that affect the terminal velocity of a falling object. Key Factors · Mass of ball bearing · Viscosity/density of the fluid · Surface area of ball bearing · Texture of the balls surface · Temperature I am going to investigate how mass affects the terminal velocity.Download