Gravitational acceleration (Simple pendulum)

Assalamualaikum and hi everyone!

Chapter 1: Measurement

This is the first experiment in Form Four Physics KSSM in the year of 2020.

Aim: To investigate the relationship between the length of the simple pendulum, l and the Period of oscillation of the simple pendulum, T

Data from observation:

There are two graph needs to be plotted by students.

1. T against l
2. T² against l, 

but, I would like to emphasize more on the second graph T² against l which later will be use to determine the Earth gravitational acceleration.

graph of  T² against l

Next, lets reveal the beauty of experiments in Physics when data analysis from experiment proving the theory


From the graph of T² against l, 

Conclusion:

The value of the gravitational acceleration from this experiment is 9.53 m s^-2  which is 97 % close to the value of gravitational acceleration on Earth; 9.81 m s^-2

Comments on students work:

1. Students' misconception between t (time take for  ___ oscillations) and T (Period of oscillation)
                        t ⇎ T
2. Secondary values reported in the table are not consistent in terms of decimal point (d.p)
3. Secondary values is calculated in the table. No need to do this because it may create confusion.
4. Graph plotting:
    (i)   For graph plotting, there are 7 points on How To Plot a Graph must be taken into measures.
    (ii)  For the first graph T against l, be sure that the y-axis is Period of Oscillation, T (not Time, t) 
    (iii) For the second graph T² against l be sure that the y-axis is Period of Oscillation, T² (not Time, t)
5. Determining the g from the graph. Unable due to haywire of the graph plotting 🤣😭😭




Reference:
Form Four KSSM Textbook, Sasbadi Publication