![]() Set 1- Static and sliding friction forces as a function of the area, the weight and the material (refer to Fig. The following shows the procedure for each se of experiment. PROCEDURES For each objective a different set of experiment was conducted hence a total of 3 sets of experiment were conducted. ![]() 2) To compare rolling and kinetic (sliding) friction forces (FR and FK) as a function of weight, 3) To determine the friction coefficient in rolling case.ĪPPARATUS One set of seven weights, 0.1 to 2 kg with hook, One set of six stand rods, L=100 mm, D=12mm, One spring balance (dynamometer) 10N, One pair of wooden blocks for friction experiments, OBJECTIVES This experiment has three main objectives to accomplish 1) To determine the static and sliding (kinetic) friction forces (FS and FK) as function of: (a)-Area, (b)-Weight and (c)-Material, and then to compare the friction forces (FS and FK) for different areas, weights, and materials. ![]() The friction coefficient (μ) between two solid surfaces is defined as the ratio of the tangential force (F) required producing sliding divided by the normal force between the surfaces (N) In this experiment, there’s two type of coefficient of friction be determined that is coefficient of static friction and coefficient of kinetic friction. ![]() This defined as the ratio between the force necessary to move one surface horizontally over another and the pressure between the two surfaces. According to type of motion, friction can also be classified into sliding friction (in the case of sliding motion) and rolling friction (in the case of rolling motion). According to velocity, friction may be classified into static friction (when v=0) and kinetic friction (when v0). To a good approximation both coefficients are independent of the apparent area of contact between the two surfaces. It is assumed for this laboratory that at the slow speeds used, µk does not depend upon speed. In fact, the coefficient of kinetic friction does vary somewhat with speed. Equation 2 states that the kinetic frictional force is a constant value any time the object is in motion. The kinetic frictional force Fk is given by Fk = µkN Where N is again the normal force. It is called kinetic friction, and it is characterised by a constant µk called the coefficient of kinetic friction. The other kind of friction occurs when two surface are moving with respect to each other. If the applied force is greater than the maximum, the object will begin to move, and static friction conditions are no longer valid. If the applied force is less than the maximum, then the frictional force thatĪrises is equal to the applied force, and there is no motion. The meaning of Equation 1 is that the static frictional force varies in response to applied forces from zero up to a maximum value given by the equality in that equation. The static frictional force Fs is given by Fs ≤ µsN Where N stands for the normal force between the two surfaces, and µs is a constant called the coefficient of static friction. Static friction arises to oppose any force trying to cause motion tangent to the surfaces. Static friction (Fs) occurs when two surfaces are still at rest with respect to each other, but an attempt is being made to cause one of them to slide over the other one. There are two different kinds of friction. The frictional force is directly proportional to the normal force. Normal force is the force that each bod exerts on the other body, and it acts perpendicular to each surface. INTRODUCTION Friction is a resisting force that acts along the tangent to two surfaces in contact when one body slides or attempts to slide across another. We found that all of the factors mentioned are directly related to the coefficient friction. Next, the average mean force was plotted against the normal force, and this slope was determined to be the coefficient of kinetic friction. The average maximum force values were plotted against the normal force for each mass, and the slope was determined to be the coefficient of static friction. The results of this experiment proved quantitatively what we as students before could only measure using formulas and equations. This experiment was accomplished by measuring the static and sliding forces of the wooden block using a spring balance. The wooden block has a layer of plastic hence the experiment was conducted on both the wooden and the plastic side separately to compare the results. Adding to that we determined the friction coefficient for the rolling case implemented on the wooden block experimented on. ABSTRACT This experiment was conducted to accomplish the objective of finding the static and sliding forces with respect to the area, weight and the material the object was experimented on.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |