Position the ball close to the metre rule so that, when it is released, it drops $60\,\text{cm}$ before striking the floor. On Fig. 2.1, show the ball in its starting position.
Before any values for the bounce height are recorded, the student makes a trial drop. Suggest a reason for doing this trial drop.
He drops the ball five times from $60\,\text{cm}$ and obtains these $h$ values: $40\,\text{cm}$, $39\,\text{cm}$, $40\,\text{cm}$, $42\,\text{cm}$, $40\,\text{cm}$. Suggest a reason why $h$ is recorded to the nearest cm.
Calculate the average bounce height $h_{av}$. Give your answer to the nearest centimetre.
On Fig. 2.3, enter your value of $h_{av}$ at $H = 60\,\text{cm}$.
To obtain larger values of $H$, the student alters his apparatus and method. Suggest how he does this.
On Fig. 2.3, plot a graph of $h_{av}/\text{cm}$ on the y-axis against $H/\text{cm}$ on the x-axis. Begin both axes at $(0,0)$. Draw a smooth curve of best fit.
The student does not collect any $h_{av}$ readings for $H$ below $60\,\text{cm}$. Suggest why these readings are difficult to take.
Use your graph to estimate the value of $h_{av}$ when $H$ is $40\,\text{cm}$.