Are we allowed to use calculus on moving about? (1 Viewer)

[jathu123]

So just a small question here, basically, are we allowed to use, and/or get marks for questions if we use calculus in the moving about graphs topic? for example, imagine they give you a displacement/time graph of a car, and it has a perfect parabolic path (or the question also gave you an equation for the motion, although I doubt they will). Lets say they want you to find the instantaneous velocity/acceleration at t=5 (or whatever). Instead of drawing a tangent there and calculating it's gradient (i always get that inaccurately), are we allowed to use differentiation to find it? are we able to get marks that way? or should we only use the traditional way?

 

[eyeseeyou]

I don't think we are. Ask your physics teachers. No one uses calculus in moving about

 

[si2136]

Not quite sure, I had the same thought too.

Compare both answers, does it match up?

 

[InteGrand]

You can use calculus to check your answer, but it's probably best to avoid it as part of your working out (unless you can't see any other way to do it).

 

[authenticity]

Sometimes part of the mark comes from drawing the straight dotted line as "working out" or showing the gradient (rise/run). So probably only use it to check your answer. HSC physics isn't designed to have background knowledge of calculus, so the marking criteria defs won't involve it

 

[Nailgun]

So just a small question here, basically, are we allowed to use, and/or get marks for questions if we use calculus in the moving about graphs topic? for example, imagine they give you a displacement/time graph of a car, and it has a perfect parabolic path (or the question also gave you an equation for the motion, although I doubt they will). Lets say they want you to find the instantaneous velocity/acceleration at t=5 (or whatever). Instead of drawing a tangent there and calculating it's gradient (i always get that inaccurately), are we allowed to use differentiation to find it? are we able to get marks that way? or should we only use the traditional way?

very unlikely to happen lol
just do it normally lol - better safe than sorry

i remember drsoccerball tried to use calculus to check an answer on a question in the hsc phys exam last year, and ended up confusing himself
(maybe it was someone else lol)

 

[InteGrand]

very unlikely to happen lol
just do it normally lol - better safe than sorry

i remember drsoccerball tried to use calculus to check an answer on a question in the hsc phys exam last year, and ended up confusing himself
(maybe it was someone else lol)

I think Drsoccerball did do that. He actually did it right though in the end I think.

 

[leehuan]

No. Do NOT insert calculus unnecessarily into a NON-calculus course.

If you want to check your answer with it then that is preference.

 

[InteGrand]

No. Do NOT insert calculus unnecessarily into a NON-calculus course.

If you want to check your answer with it then that is preference.

Didn't Drsoccerball do it in the HSC Physics exam or something?

 

[leehuan]

Didn't Drsoccerball do it in the HSC Physics exam or something?

I, for one, whilst not really caring about if he used it to check, don't formally approve of if he used the method to actually solve the question

 

[porcupinetree]

You can use calculus to check your answer, but it's probably best to avoid it as part of your working out (unless you can't see any other way to do it).

No. Do NOT insert calculus unnecessarily into a NON-calculus course.

If you want to check your answer with it then that is preference.

I second these. Prelim & HSC Physics is designed to be a non-calculus course - there's a probability of exactly 0 that you would NEED to use calculus while working out. In addition, while it may be useful to use calculus in checking your answer(s), the markers do not want to see calculus in your working out.

 

[jathu123]

Ah okay, thanks for the clarification guys