Virtual lab
Run an investigation properly. Plan it, take the readings, build the table, plot the graph and write the conclusion. The apparatus has measurement error in it, the way real apparatus does — which is exactly why repeat trials and averages matter.
Does hot water dissolve sugar faster? To investigate the effect of water temperature on the time taken for a sugar cube to dissolve. Does a bigger parachute fall more slowly? To investigate the effect of parachute canopy area on the time taken to fall 2 metres. How does a shadow change during the day? To investigate the effect of the time of day on the length of a vertical stick's shadow. What temperature do yeast cells respire fastest at? To investigate the effect of temperature on the number of gas bubbles produced by yeast in 5 minutes.