Effect of friction on the efficiency

Tezcan, Emre (2010) Effect of friction on the efficiency. other thesis, TED ANKARA COLLEGE FOUNDATION HIGH SCHOOL.

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Abstract

This experimental study investigates the effect of friction on the efficiency of a pulley system. Efficiency of systems is affected by problems like friction, which is also a major problem for energy consumption in the world. In a pulley system consisting of an electric motor, fixed pulleys and a load; “Does changing the number of pulleys in a pulley system affect friction and hence efficiency of the system to alter?” question is tested. The experiment was made in two parts. First, revolutions per minute (rev/min – rpm) pattern of the electric motor was plotted on a graph. After deciding the voltage for second part, the effect of friction on the efficiency of the pulley systems was investigated. For that, the number of pulleys attached to the system was increased step by step and how high (meters) the 0.1 kg mass is pulled in 1 minute time by the electric motor is measured. Comparing theoretical height and measured height values gave the energy loss at the system. According to the law of conservation of energy that loss should be due to the effect of friction. So, the efficiency of the system was calculated using the data gathered. The results were plotted on a graph and they showed that as the number of pulleys in the system increases from 1 blue pulley to 5 black & 5 blue pulleys step by step, the efficiency of the system decreases from 99.598 % to 96.185 %. Those results show that increasing number of pulleys in a pulley system affects friction to increase and hence efficiency of the system to decrease.

Item Type: Thesis (other)
Additional Information: Supervisor: Yasemin Çınaroğlu IB Notu: B
Uncontrolled Keywords: efficiency; energy consumption; pulley system
Subjects: Q Science > QC Physics
Depositing User: Kamil Çömlekçi
Date Deposited: 10 Jun 2010 10:51
Last Modified: 23 Feb 2011 07:25
URI: http://tedprints.tedankara.k12.tr/id/eprint/110

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