# Pulley System Extended Essay

Topics: Pulley, Force, Simple machine Pages: 28 (7622 words) Published: January 24, 2013
INTERNATIONAL BACCALAUREATE

EXTENDED ESSAY
PHYSICS

The simple Pulley system and its efficiency

Research Question:

“How does the length of wire and thickness of wire affect the efficiency of Atwood’s machine?”

NAME: MUHAMMAD HARIZ BIN MD YUSUF
MAY SESSION 2013
CANDIDATE NUMBER:
002348-086

CENTRE: MARA COLLEGE SEREMBAN, JALAN AMINUDDIN BAKI, 70100 SEREMBAN, NEGERI SEMBILAN, MALAYSIA.

NUMBER OF WORDS: 3592
NUMBER OF PAGES: 34
Abstract

The thickness and the length of wire are the properties which affect the efficiency of pulley system. To find out the best length and thickness of wire and rope that suitable to use in a pulley system, an experiment is conduct by using various thickness and length of wire with the fixed type of wire and masses in the system included the weight and glider. This is suitable according to its research question, ‘How does the length of wire and thickness of wire affect the efficiency of Atwood’s machine?’ This research is to solve the problems of finding the suitable length and thickness of wire need to use in a pulley system to achieve the maximum efficiency of the machine.

In the early of experiments, research question and variable is designed. Then, all the apparatus and material needed in the experiment arrange according to the methodology constructed. The comparison is carried out then by observing and analysing the graph form from the various thickness of wire that has the same length for each length been used in the experiment, which 0.2m, 0.4m 0.6m, 0.8m and 1.0m. While the thickness of wire that has been used in the experiments are 0.20mm, 0.25mm, 0.30mm, 0.35mm, and 0.40mm. The entire graph formed, then is observed thoroughly to find out the relationship between the efficiency and the thickness and length of wire.

At the end of experiment, a conclusion is gained and hypothesis is accepted, although there some errors in the experiment due to some limitations and weaknesses. After data obtained and graph plotted is analysed carefully, the optimal length of wire can be identified, but not with the thickness of the wire. There are much more to be improves in the future research, so this reports come out with suggestions at the end.

(300 words)

Acknowledgement

First and foremost, I would like to gratitude to MARA for giving me such best opportunity to be an IB student which lead its students, to be an all rounded and independent student. Especially during finish my extended essay that tough how though the future assignment will be done in the next stage of study, degree and afterwards.

Next, I would love to express my gratitude to advisor and physic teacher that always guide me the right path in making this essay done. Not to forget to my family and friends that always supports me to finish this up.

Finally, I hope that my research would be benefit to anybody that will be using the simple pulley system to produce the best efficient pulley system and conserve some energy in the daily life.

Contents
Abstracti
Acknowledgementii
1.0- Introduction1
1.1- Research question1
1.2- Aim of the experiment1
1.3- Significance of experiment1
2.0- Literature review2
2.1- Atwood Machine2
2.2- Law of conversation of energy5
2.3- Newton’s Law of Motion5
2.4- Efficiency7
2.5- Forces, work and energy7
3.0- Early of the experiment10
3.1- Hypothesis10
3.2- Variables10
4.0- Methodology11
4.1- Controlling variable11
4.2- Conducting experiment12
5.0- Data collection14
6.0- Data processing17
7.0- Conclusion and Evaluation21
7.1- Data analysis and evaluation21
7.2- Evaluation and discussion25
7.3- Limitation, weaknesses and effects28
7.4- Conclusion29
7.5- Suggestion for improvements30
8.0- Bibliography31
9.0- Appendices32

1.0- Introduction
1.1- Research question

Every machine has it owns efficiency, same goes to Atwood’s machine. It is made up of few components such as the...