- #1

- 309

- 7

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Testing
- Thread starter -Dragoon-
- Start date

- #1

- 309

- 7

- #2

jtbell

Mentor

- 15,866

- 4,459

Which course are you taking?

- #3

- 309

- 7

Which course are you taking?

Introductory physics I.

- #4

- 798

- 1

Moreover, do you understand what is being asked? If you cannot absorb the question instantly, display an array of formulas that pertain to the particular problem, and asses the values that are given in the problem. Are all of these values relevant? What assumptions are being made?

Lastly, rest easy before an examination and eat healthy food. It takes practice to become good at these topics; some more than others, but nonetheless it takes practice.

- #5

AlephZero

Science Advisor

Homework Helper

- 7,002

- 297

Is it better in those cases to just mindlessly "plug-n-chug"?

That depends whether you want to learn some physics, or just scrape through your exams.

But the "mindless" approach may not work anyway if you are being set

It could be that Mechanics is the first course you have taken where you need apply a few general principles to a large range of situations. You had better get used to doing that, because that's the way most of your courses will be from now on.

- #6

- 311

- 0

Im a bit confused, If you can solve the problem correctly by simply plugging and chugging then whats the problem. Why draw diagrams and list unknowns if you already know how to get to the answer?

- #7

- 309

- 7

Moreover, do you understand what is being asked? If you cannot absorb the question instantly, display an array of formulas that pertain to the particular problem, and asses the values that are given in the problem. Are all of these values relevant? What assumptions are being made?

Lastly, rest easy before an examination and eat healthy food. It takes practice to become good at these topics; some more than others, but nonetheless it takes practice.

Again, drawing two diagrams for both objects and then two free-body diagrams can take major time away from the analysis of the question. Usually, these are the types problems that tend to be complex, problems with forces acting on two masses.

Eventually, working through so many dynamics problems, I am seeing a recurring pattern in which you have two equations and two unknowns and are constantly solving for those two unknowns, while some other variables cancel out. Wouldn't it be better to just use these shortcuts on exams rather than starting every question from scratch and writing out Newton's second and third laws for every component of every mass?

- #8

- 309

- 7

That depends whether you want to learn some physics, or just scrape through your exams.

But the "mindless" approach may not work anyway if you are being setgoodexam questions which test if you understood the material, and not just if you can memorize how to do the questions on last year's exam paper.

It could be that Mechanics is the first course you have taken where you need apply a few general principles to a large range of situations. You had better get used to doing that, because that's the way most of your courses will be from now on.

I enjoy working through problems and I have never "plugged-n-chugged" since high school. I'd even prefer exams with 4 very very difficult questions and work through them systematically, but unfortunately my exams are not structured like that. When you have 13 questions to get through, it is not feasible to draw diagrams for all of them and write out Newton's second and third laws and list the knowns and unknowns. That's what happened to me last time and is the main reason why I received such a low mark.

Share: