# 1201W1 - Katherine Burger Physics 1201 W-208 Yulong Li...

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Katherine Burger Physics 1201 W-208 Yulong Li 3665659 Lab 2 Problem 4 STATEMENT OF THE PROBLEM : This experiment was to determine the coefficient of kinetic friction of an object moving down a ramp. This is because we were “working” with a biotechnology company that is investigating substances that organisms produce to cope with their environment, which may be useful to humans. An example of this is the oil that fish produce to reduce friction between themselves and water. This oil may then be used as a substitute for a lubricants in machinery. To test its effectiveness of a possible substitute, an object was moved down a ramp to find the coefficient of kinetic friction. PREDICTION : To find the coefficient of kinetic friction, data gathered from the action of the block sliding down the ramp was used. At a minimum angle with the force of gravity, the block will overcome the coefficient of static force and will slide down the ramp, demonstrating the change from potential energy to kinetic energy. The value of the coefficient of kinetic energy may be found using other forces pertaining to the block, such as net force, gravitational force, and normal force. These forces were found using the mass of the block, the angle of the ramp, and the time it took for the block to move down the ramp. Gravity (g) was assumed to be 9.81 m/s² Each of the forces observed in the diagram have a contributing factor towards the overall coefficient of kinetic friction. The block moves when the coefficient of kinetic friction (μk) is equal to tanΘ. Other equations used are: Normal force (N)=mass*g*cosΘ Force of gravity (Fgx)=mass*g*sinΘ Force of kinetic friction (Fk)=μk*N Force of kinetic friction (Fk)=Fgx-Fnet

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## This note was uploaded on 10/20/2010 for the course PHYSICS 1201W taught by Professor Zudov during the Spring '10 term at Minnesota.

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1201W1 - Katherine Burger Physics 1201 W-208 Yulong Li...

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