Problem Set Week 05

### Before Lab

Q112. Sketch a causal loop diagram representing this logic:

1. …makes you frown…
2. …which makes people avoid you…
3. …which makes you lonely…

Q113. Sketch a causal loop diagram for this system (be sure to label each link and the overall loop). Comment on the long term equilibrium of this system.

• Being happy…
1. …makes you to smile…
2. …makes people approach you…
3. …makes you feel social…
4. …makes you happy…

Q126. Why do people scream into cell phones? Answer in terms of feedback.

Q131. Draw a causal loop diagram that illustrates the process of feeling hungry, eating, becoming satisfied, stopping, getting hungry again.

Q128. Consider the act of filling up a bathtub for a baby (or yourself!). You have a faucet that you can turn more towards hot or toward cold. List out the flows, the stocks, the sources of information, the "valves," and the rules that govern the valves in this system.

Q129. Draw a stock and flow diagram for filling up a bathtub for a baby (or yourself!). You have a faucet that you can turn more towards hot or toward cold. Be sure to show the flows, the stocks, the sources of information, the "valves," and the rules that govern the valves in this system.

### In Class/Lab

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