Conduct a fair-test investigation comparing collisions from different ramp heights to gather data on how starting height changes the energy transferred.
This week you run a real experiment instead of just predicting. A marble released from higher up a ramp picks up more speed by the time it reaches the bottom, so it should carry more energy into whatever it hits. A fair test lets you check that idea with real numbers instead of a guess.
The key to a fair test is changing only one thing at a time. Here, that one thing is the release height. Everything else, the marble, the ramp, the target you are hitting, stays exactly the same from trial to trial, so any difference in the result can only be explained by the height.
Mastery looks like: They can run a fair test changing only release height, record real distance data, and state that greater height produced greater energy transfer.
Common stumbles: Changing more than one variable between trials (a different marble, a bumped ramp); drawing a conclusion from a single trial instead of a repeated pattern.