- #1

hihiip201

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B, K, M

2. Homework Equations

1. xs(t) -----spring ----mass-----damper-----fixed, derive DE for x of mass

given :2. F - > M -----spring-------damper ---- fixed in series, derive the DE for velocity of spring

3. The Attempt at a Solution

1. ma = -k(x-xs) - B(v)

But I don't understand, why aren't we taking the natural length of the spring into account?

2. no idea, I have the solution and it says that damping force is B(v(t) - vk) , but I have no idea what v has anything to do with damper, the relative velocity vb should just be vk - 0 to me but the textbook and the homework solution suggest otherwise.