The labs 4.1, 4.2, and 4.3 demonstrates how weight, mass, and surface area affect the amount of friction on an object. In lab 4.1, there were five different sliding surfaces that were tested. The surfaces tested were tabletop, Waxed paper, paper towel, fine sandpaper, and coarse sandpaper. Each of the surfaces had four of the same blocks that was attached to a spring scale to the blocks and drug one at a time across the surface. For 4.2, the graph showed a comparison between two surface type averages. For 4.3, the surface frictions were weighed with a spring scale. For 4.1, the lab was to slide a certain amount of blocks of a different surface for four trials for each surface. There was a spring scale attached to a block and then, the directions were to pull it …show more content…
The surface types were Tabletop and Coarse Sandpaper. Both of their averages for the 4 trials were graphed. The Tabletop averages went up around 0.75N-1.25N each time. The Coarse Sandpaper averages went up by a rough 2N every time. Lab 4.3 explains how surface area affects the frictional force. Sliding friction does not depend on Surface Area. During the lab, the area was 2x larger and the amount of force stayed the same, as well as 3x and 4x larger. For 1 block the amount of Newtons, it took to get across a surface type was 2N. The surface area increase by 2, 3 and 4 and the Force it took to get across stayed at 2N. In conclusion, the labs explain that no matter what the surface area is the amount of friction does not change. Friction comes when two forces rub together. In lab 4.1, different surface types were tested. Frictions are affected by surface type, such as coarse sandpaper or. waxed paper, the friction would be different with a different surface type. In 4.2 the lab shows how friction is changed by surface type. While in 4.3, it is shown that the surface area is not a variable that changes the amount of friction on an
surface area by taking a sample of 10 or 20 - this would give a good
= I have decided to produce a step-by-step guide for each experiment. just to ensure that when we actually come to conducting the practical work, it runs flawlessly. This will also help us conduct fairer tests. as we will be following the same set of steps each time we collect a result.
In the experiment these materials were used in the following ways. A piece of Veneer wood was used as the surface to pull the object over. Placed on top of this was a rectangular wood block weighing 0.148-kg (1.45 N/ 9.80 m/s/s). A string was attached to the wood block and then a loop was made at the end of the string so a Newton scale could be attached to determine the force. The block was placed on the Veneer and drug for about 0.6 m at a constant speed to determine the force needed to pull the block at a constant speed. The force was read off of the Newton scale, this was difficult because the scale was in motion pulling the object. To increase the mass weights were placed on the top of the ...
· Mass of weight - I believe it will have a very big impact on the
When an object is dragged across a surface, the force of friction that must be
3. The three differences between the materials we used was that in one we had liquids in which we tested how the density effects the refraction of light. In a different one we had reflective surfaces where we tested how the path of light was affected with different angles of the reflective surface. The last thing was we had different measurements to be taken because we were looking for different things.
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affected by the mass of the object but I am going to use the same
First we placed the slide under the simple microscope and observed it at ten times magnification level. We each took turns looking. We then copied them as drawings into our Cornell notebooks. After that we changed the magnification to fifty times and observed the slide. We each took turns looking. We then copied what we saw into our Cornell notebooks. After that we changed the magnification level to sixty times and we each took turns looking at the slide. We then copied what we saw into our Cornell notebooks and sat down together. When we were all done drawing we spoke about what we seen and gave each other ideas on how to write our Lab Reports.
Though the phenomena itself is as old as any other branch of Physics, the focus on wear aspects of Material and development of the field as a separate study in its own right is rather new. Tribology is a relatively young branch of Mechanical Engineering, introduced in 1966 by Prof. H. Peter Jost in his report for the UK Department of Education and Science. The Oxford English dictionary defines Tribology as “the branch of science and technology concerned with interacting surfaces in relative motion and with associated matters (as friction, wear, lubrication, and the design of bearings)”.
METHOD / MEDIA: I will use the lecture method and the mortar you see in front of you. There will be no posttest after this period of instruction. Are there any questions about your learning objectives or the method and media?
The effect of molecular weight to the rate of diffusion of some substances was determined using two experiments that require glass tube and petri dish of agar-water gel with three wells. In the first experiment, two cottons were soaked in hydrochloric acid (HCl) and ammonium hydroxide (NH_4OH), respectively and were placed at the both ends of a glass tube simultaneously. The second experiment involved three wells filled with a drop of potassium permanganate (KMnO_4), potassium dichromate (K_2 Cr_2 O_7), and methylene blue, respectively. At a regular three-minute interval starting from zero minute to thirty minutes, the diameter (mm) of the colored area of the three substances was observed and recorded. The partial rates of diffusion
The purpose of the experiment was to determine what factors affect the force of friction through experiments. The objective was to understand how the coefficient of friction is derived from the normal force and force of friction and to determine if the area of contact between the surfaces produces different values for the forces of friction.
Sliding friction can be related to static friction. For example if you were trying to move a piece of furniture around on carpet, at rest static friction is acting upon the furniture but after you push the furniture it starts to slide around on the carpet, this is called sliding friction.
Several different mechanisms have been proposed to describe the manner in which the material is removed. Three commonly identified mechanisms of abrasive wear are: