The four parts in which I had to go through this investigation was:

Question

Part 1: Practice
Part 2: Does mass affect the swing rate of a pendulum?
Part 3:Does Arc length affect the swing rate of a pendulum?
Part 4:Does Length affect the swing rate of a pendulum.

It asks why was it necessary to do this investigation in four parts?

I just put, that it was necessary to do this investigation in four parts because each part has a variable which we have to go through to see if it will affect the swing rate of the pendulum.

More info would be appreciated, thanks :-) I posted this yesterday as well, but got no responses back, but that's alright :-)

Answer 1

It seems to me that you've answered your own question, but you could add that to test one certain part to see if it affected the swing rate you had to keep all other parts constant. You can't just change everything at once and expect to be able to see what affects it and what doesn't.

Answer 2

This was YOUR lab experiment. Your first answer is fine. Your next three answers should be based upon your findings.

Part 3 requires careful measurements up to a wide swing angle (or arc length). I hope your tried 60 degrees from vertical at least.

Answer 3

Thank you so much Gabrielle, thank you drwls :-)