well i cant help coz im failing physics, but ask your teacher if the prac is at all related to the syllabus....because....
North Sydney Boys High School (you know, one of the top phys schools in NSW) Physics Trial Practical 2005:
Measure the width of the shadow of a cube when it is 15, 20, 25, 30, 35, 40cm away from the light source. Graph the results.
IM FINALLY NOT GONNA FAIL A TEST!!!!!!!!!!!!!
honestly what type of bullshit is that. measure something with a ruler, then graph.