lucy_
One main thing to talk about in the rationale is the independent and dependent variables, and how they affect each other. Then you use the equation, and explain the equation itself. For example, does g decrease or increase as the angle increases? What sort of relationship is it e.g. inverse proportional, directly proportional, exponentially increasing etc. How is this shown through the equation. Remember to talk about modifications and how exactly they improve the original experiment. @PhytoPlankton I am more than happy if you shoot tips and everything, I don’t see it as stealing my thunder haha

I also highly suggest thoroughly understanding the marking criteria

Hope this helps,
-jinx_58

      jinx_58

      Oh okay! So i do it in that order? And do I just say the following modifications were made, as this will link to my modifications section of the report? Oh and how do you justify the modifications. Do you just say it will increase reliability, and compare this to the oe?

          lucy_
          Hey lucy_,

          @jinx_58 is absolutely right. If I were to recommend an order, this is what I would do:

          • Briefly explain the original experiment (this can be done at the very start or at the very end of the rationale)
          • State the independent and dependent variable which should lead onto the below:
          • You need to discuss the theoretical vs experimental equations. So this is where you discuss how you are going to calculate g from your experimental data and then you need to discuss the equation you are going to use to find the theoretical values for g.
          • The derivation of the equations (especially for the experimental) needs to be shown, if necessary.
          • This will then lead to you stating your relationship (like @jinx_58 stated)
          • And that's basically it.
          • This should lead to your research question which you may/may not connect to your rationale.

          The only issue I find is that when you say you are looking for a value for g, you have to measure two variables and identify a relationship. So it seems you won't be discussing about the relationship/trend as much but rather how you extract/calculate g from that. Is that true or are you expected to discuss the relationship in depth like normal (which would make sense)?

          Hope that helps and good luck!

          • PP

              PhytoPlankton

              I think relationship, as well as extracting g, which I've done but I'm not sure if it's right... I'm not really sure what my teacher wants, because they're new T.T

              Once I've done my rationale am I able to share it to you all, just to see if it's okay? I'm wanting to get a 19 this time round, because it is the final! And I'd like to do well in physics (just to make all my tears and sleepless nights were for some purpose and also Asian parents).

                  Bonsoir bonsoir,

                  I have just finished writing my rationale. I'm not sure if it's okay to post this on a public forum, as plagiarism detectors, but I would like to get it checked by you smort people! Any ideas on what to do? Tyyy

                    PhytoPlankton

                    No one would be able to access that, except you guys right? Because I don't want anyone stealing my work 😅

                    Ohhh, but it says to share the link means to let everyone anywhere have access T.T

                      Bonsoir bonsoir,

                      Anyway ignoring that for now, and hopefully finding a way to share it privately, but I don't know how to do the uncertainty for 1/sqrt sin theta. It's just against time. I've found the times uncertainty, but I don't understand how to do it for the angle one 1/sqrt sin theta:

                      Data here! https://drive.google.com/file/d/19m8FXT87ZXdJpq8pzEnf95VSfncP_KaI/view?usp=sharing

                        lucy_
                        Hey lucy_,

                        Yeah, I think you would need our email addresses to share it privately but it seems there's no way of giving my email to your privately either. So, maybe you could make a google drive link, post it really quickly and I can download it and then you can delete/remove the link?

                        As for your uncertainty question, you do not need to "find" / "calculate" the uncertainty of the independent variable. Since you are not measuring it, there is no uncertainty in its calculations/measurements. There is only uncertainty in the equipment in which you measure the angles (e.g. a protractor). To find that, it's just the smallest increment on the tool which it seems you have already figured out (in the brackets next to the heading Angle). This would apply to the 1/sqrt sin theta as these are not dependent variable values if that makes sense. That 1/sqrt sin theta will stay constant whether or not you do the experiment 1 time or 100 times.

                        I hope that makes sense.

                        • PP

                          Okay cool, I'll let you know about the rationale when I've done it, cause I actually need to redo it completely. I didn't understand the oe, so I didn't really know what to talk about, but hopefully by Sunday or so I can send it through.

                          Also with the uncertainties, my teacher said that I need to propagate the uncertainty to find 1/sqrt sin theta, and I wasn't sure what she meant. But if so, then the uncertainty for both the actual angles and 1/sqrt sin theta would be +-0.5 degrees (for like every measurement?).

                          Thanks by the way, you both are very helpful!

                          a year later

                          Hello everyone,

                          I was wondering if you guys could help me with this physics question?
                          A water skier at the Moomba Masters competition in Melbourne leaves a ramp at a speed of 50 km h−1 and at an angle of 30°. The edge of the ramp is 1.7 m above the water. Calculate:

                          a) the range of the jump

                          b) the velocity at which the jumper hits the water.

                          Thank you!!!

                          a month later
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