The observation and its tabulation were well handled by most responding candidates. However, the evaluation of Log **L** and Log **T** to the nearest decimal places was poorly tackled.

The plotting of the graph of log **T** against Log **L** was poorly handled. Evaluation of slope and determination of intercept on the vertical axis was fairly attempted. Candidates were able to state the precautions correctly in acceptable language.

The part b was fairly handled by most responding candidates as they were able to define simple harmonic motion but could not satisfactorily deduce the value of **L** from the graph when t = 12s probably because of the Logarithm involved.

In part (a) candidates are expected to:

- Measure and record five values of **L** to at least **1** d.p. and in trend.

Trend: As **L** increases, **t**, decreases

- Evaluate **five** values each of **T**, log **L** and log **I** to at least 3 s.f.

- Record data in composite table

- Plot **five** point, correctly using reasonable scales and distinguished axes

- Draw line of best fit.

- Determine the intercept on the vertical axes and the slope of the graph using large

right-angled triangle.

State any **two** of the following precautions in acceptable language.

- Ensured supports of pendula were rigged

- Avoided parallax error on meter rule/stop watch

- Zero error was noted and corrected on metre rule/stop watch/clock

- Ensured smooth and regular oscillations in a horizontal plane

- repeated readings shown on table

Part b expected answer are:

- Simple harmonic motion is the motion of a body whose acceleration is always directed towards a fixed point and is proportional to the displacement from the fixed point.
- T = = 1.2 secs

Log 1.2 = 0.079

0.079 shown on graph with corresponding log **L** read

**L** correctly determined.