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### Transcript of Pendulum ssi

Slide 1

ASSIGNMENT 2 : DATA LOGGING ~PENDULUM~

NAMA PENSYARAH: EN.AZMI BIN IBRAHIM

SHAFIQ

ENGAGEDoes length of string affect the period of oscillation?

Pendulum is a hypothetical pendulum suspended by a weightless frictionless thread of constant length.The pendulums period is tested by using different length of spring .Which length of string that slower and faster the period of the pendulums oscillation?

4

How to avoid damping?What other application that similar to pendulumWhat is the graph shape?What can you get from observing the experiments

EMPOWER~DATA FINDINGS~

PROCEDURE The apparatus was set up as shown in figure 1.The length of the string that attach to the constant mass was set as 20cm length.The pendulum is displaced sp that it performed oscillation of simple harmonic motion.The data were recorded automatically by using motion detector.Stop the experiment after te pendulum has make 20 oscillations.The period,T for the 20 oscillation were determined.The experiment was repeated by subtituted the length of the string 10cm length

Figure 1

DATA STUDIO SOFTWARE

RESULTGraph of angular position () against time(s) for string length 20cm.

RESULTGraph of angular () against time (s) for string length 10cm

DATA ANALYSIS

From the graph obtained ,we can conclude the data as table below.

Data analysis

DATA ANALYSIS

DATA ANALYSIS

DATA ANALYSIS

DATA ANALYSIS

DISCUSSIONFrom experiment ,we use data logger as the medium to detect the time and the angular positions of the pendulum.From the graph ,the time to complete 20 oscillation can be determine .The period calculate by using time to complete 20 oscillation divided by 20.The time taken 20 oscillation for 20cm string was 19.23s and the time taken for 10cm string was 15.89s from the formula below.

The time taken for oscillation , T is directly proportional to the string length, l .Therefore ,the longer the l , the longer the T.

DISCUSSION

By using the formula:

The acceleration of gravity is calculated was 8.67ms

The percentage error calculated in this experiment is 12.64%This indicated that there were some errors that occurred during the experiment process. There errors could be: -Air resistance( solution : do the experiment at the vacuum - Human error (solution: measure the length of the l precisely and carefully

CONCLUSIONFrom the experiment , the value of gravitational acceleration obtained is 8.67ms is 12.64% percentage error compare to the theoretical value which is 9.81ms

The longer the length of string , the longer the period for oscillation taken.

The data logging application used was Data studio which the data reading taking automatically by the computer.

ENHANCE~APPLICATION OF PENDULUM~

CASEFirefighters had to rescue a boy aged 10 that carried by the water flow to other side of river .Which rope should be used by the firefighter to get to other side in the short time??

Why??Explain?

How to make this item swing for long time ??