1. Frequently Asked Questions
SE 207
Unit 2

2. 1. In some diagrams, Masses are shown to move on small wheels
1. In some diagrams, Masses are shown to move on small wheels. What does this represent?
Answer:
This means that the friction between the two surfaces is negligible.

3. 2. How many free body diagrams are needed to obtain the equations of motion of a mechanical system?
Answer:
You need to draw a free body diagram for each mass or junction point that moves with a velocity that is unknown in advance.