Science Experiments

Question: I REALLY NEED HELP!!!!! Any ideas for a science experiment?

I need a science question that I can experiment with. And it must be testible and measurable. Any ideas? It’s due Thursday and I still have nothing to test. It’s for my 9th grade Physics class.
It must be simple, fastish, easy, and able to do outside of class please!!!! I can’t think of anything. And it has to be something I could so with an everyday item. So I don’t have to go out and buy stuff.

Oh, and it CANNOT be just a fun experiment. I have to be solving a question.
I have to make a report that goes like this:

Question:
Hypothesis:
Independent and Dependent Variables:
Constants:
Materials:
Analiysis:
Conclusion:

Answer: well…my friend and i did an experiment on fertilizers…we had like 6 plants. We used organic and non-organic fertilizers..that way we could tell if the nutrients in the fertilizers had anything to do with how the plants grow. You can grow them form seeds…which i suggest..or buy some plants and record the heights when you first get them! then you have those height to the heights of the plants when their growing period is over! i also suggest u keep at least one plant that does not have fertilizers in it..im not sure what ur looking for..but hey its an idea

Floating Bowling Balls – Cool Science Experiment