As shown in Fig. 3.1, the bottom of mass hanger A is at a height $h$ above the floor. Record $h$ from Fig. 3.2.
Describe one source of error that could occur when measuring $h$, and suggest one improvement to the method that would reduce this error.
The student places a mass $m = 5.0\,\text{g}$ on mass hanger A. Using the stop-watch readings in Fig. 3.3, determine a precise average time $t_{av}$ for the mass hanger to descend the height $h$. Show your working.
Transfer the measurements from (b)(i) into Table 3.1. Fill in the headings and include units.
On the grid on page 11, plot average time $t_{av}$ on the $y$-axis against mass $m$ on the $x$-axis. Then draw the best-fit curve.
Describe the relationship shown by the graph between $t_{av}$ and $m$.