# Conceptual questions

The following are links to hints and suggestions on the conceptual problems that appear at the end of each chapter in the lecture book. Note that for virtually all of these questions we are not expecting you to just "know" the answer based on your intuition. In each case, instead, you need to perform some simple analysis first, and from this analysis, draw conclusions on the answers.

Our hope is that through such conceptual questions your intuition on dynamics will develop beyond just remembering methods and procedures. You will see similar conceptual questions on your quizzes and exams in this course.

## 7 thoughts on “Conceptual questions”

In chapter 1, question 10, how would Va/b /= Va-Vb. I understand b is curving, but I am not sure how this can algebraically be shown.

2. CMK says:

Two things that are always true: v_A/B = v_A - v_B and v_B/A = v_B - v_A.

As stated in the book and discussed in class, v_A/B is "the velocity of A as seen by a non-rotating observer at B". Since, for this problem, B is rotating, response (b) is not correct. Response (a) is correct, however, since A is not rotating.

3. Keerthi Krishna Reddy says:

I think the answer written on the document for C3.3 is wrong about a_o as the answer has it in the i_hat direction, but it should be in the I_hat direction

4. Casey says:

for question C5.10 if C slips while moving to the right, that means friction force is equal to zero right?

5. Casey says:

never mind even though it's slipping it still has Muk acting on it

6. Michael Lie Setiawan says:

For question C5.7, points E and O are neither the center of mass nor a fixed point. However, if the disk were rotating about O, wouldn't that make O a fixed point? Wouldn't that also make the acceleration of E point in towards O, meaning its acceleration is parallel to the center of mass G?

7. Keri says:

On conceptual question C6.6 how can I intuitively know that the top spring and the spring between block A and block B are stretched?