In Fig. 2.1, indicate the height $h$.
In Fig. 2.1, indicate the distance $d$.
Suggest an item of apparatus that could be used to measure these two lengths.
The experiment is done again. The glass ball moves the following distances: $23.5\,\text{cm},\;20.8\,\text{cm},\;22.3\,\text{cm}$. Calculate the average distance $d_{av}$ travelled.
The initial gravitational potential energy $E$ of the metal ball at the top of the slope is found from $E = mgh$, where $g$ is $10\,\text{N kg}^{-1}$ and $m$ is the mass of the metal ball. The metal ball has mass $m$ of $0.0081\,\text{kg}$. The height $h$ of the ramp is $0.120\,\text{m}$. Calculate $E$, giving your answer to $2$ significant figures.
Complete the table for the metal ball of mass $0.0081\,\text{kg}$ using your answers to (a)(iv) and (a)(v).
On Fig. 2.3, draw the graph of $d_{av}/\text{cm}$ on the $y$-axis against $E/\text{J}$ on the $x$-axis. Begin both axes at the origin $(0,0)$. Draw the smooth best-fit curve.
Suggest a reason why the student covers the bench with a cloth.