Controlling variables can be a subtle concept
for some students, especially when they are testing their
own designs. For instance, more chute area slow descent, but
this increases mass. Earl lets his students experience such
difficulties, all the while allowing them to fail. Do his
students see this of their work yet? What questions were helpful
in focusing on this issue?
Questions for MOVIES 1 & 2:
1. How successful were teams in designing controlled experiments?
2. What key science ideas relate to each of the design variables
Rules-of-Thumb aim to give test-based advice from one
designer to another. Which rules-of-thumb seem most successful
at doing this?