Research question: Part A : What is the static friction coefficient of a certain surfaces that are in contact? Part B : What is the kinetic friction coefficient of a certain surfaces that are in contact?

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NAME

MOHD SUKRI BIN ISMAIL

PARTNER

FIKRI AKMAL MOHD SALLEH

CLASS

E03F

DATE

September 6th, 2004 and September 14th, 2004

TITLE

INVESTIGATION OF THE ROUGHNESS OF TWO SURFACES IN CONTACT

(friction)


Abstract:

        This experiment is conducted in two different parts; part A is the determination of the static friction coefficient whilst part B is the determination of the kinetic friction coefficient. In part A, after the apparatus are set up as shown in the diagram, the length of the wood plane used as the track is measured. Then, the plane is elevated gradually at one of its end. The plane is held still using a retort stand when the block rested on the plane is moving, in order to reduce the error in measuring the height of the elevated end of the plane from the desk surface. The experiment is then repeated by using different surfaces which were between glass/wood and wood/sand paper. The value of the static friction coefficient is calculated by using the formula of = tan or by using the ratio of the height of the elevated end of the plane to the horizontal length of the plane. From the experiment, it can be determined that the static coefficient for wood surface with wood surface is 0.454, glass and wood is 0.315 while the sand paper surface with wood is 0.785.        In part B, the kinetic friction coefficient is determined by using the acceleration of the object while it is moving. The acceleration is calculated by using the marks dotted onto a strip of ticker tape. The value of the coefficient is determined by using the formula of. From the experiment, it can be determined that the kinetic coefficient of wood surface with wood surface is 0.3290, glass surface with wood surface is 0.2390 and between the sand paper surface and wood surface is 0.4780.

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Research question: 

Part A        : What is the static friction coefficient of a certain surfaces that are in contact?

Part B        : What is the kinetic friction coefficient of a certain surfaces that are in contact?

Hypothesis:

Part A        : The greater the coefficient, the rougher the surfaces. The coefficients are different between different surfaces. This is due to the fact that if the object is having bigger angle of inclination, it shows that the coefficient is bigger. Thus, it can be concluded that the surfaces are rougher.

Part B        : The greater the coefficient, the rougher ...

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