Question

choose a design to prototype before you can do more rigorous testing, you must choose a design to prototype from the designs you brainstormed. use your knowledge of scientific principles to decide which design you think is most likely to meet your criteria within your given constraints. 13. which of the following designs is most likely to satisfy the criteria and constraints? criteria and constraints 1. the device helps the user wake up at a specific time. 2. the device does not interfere with the user’s sleep. 3. the device is safe for the user. 4. the user can specify the time the device turns on. 5. the device is easily reset. images: a (blanket rises as bucket lowers), b (compressed spring releases), c (bucket tips with water), d (blanket rolls with electronic timer) 14. consider the five criteria and constraints listed in the table. which one indicates that you should consider the potential energy of the system when selecting the most promising solution? explain your reasoning.

Explanation:

Question 13 (Choosing the best design)

1. Meets "Wake at specific time": Electronic timer allows precise time setting to trigger the blanket movement, helping wake the user.
2. Does not interfere with sleep: The blanket rolling is a gentle (or non - intrusive) mechanism compared to others (e.g., A’s slow blanket rise might be too gradual, B’s sudden spring release could be jarring, C’s bucket tipping is less predictable).
3. Safe for user: No sharp parts or sudden jolts that risk injury, unlike B’s spring or C’s tipping bucket.
4. Specify time to turn on: Electronic timer enables user to set the trigger time easily.
5. Easily reset: The electronic timer and roller mechanism can be reset (e.g., re - set the timer, reposition the blanket) with minimal effort, more so than mechanical designs like A (re - filling the bucket) or C (re - filling and re - positioning the bucket).

Question 14 (Criteria related to potential energy)

• Potential energy (e.g., in a compressed spring like design B, or a raised bucket like design A/C) is converted to kinetic energy when released.
• If a design relies on high - energy potential energy storage (e.g., a tightly compressed spring), its release could be sudden and disruptive (interfering with sleep). Considering potential energy helps assess if the energy release is gentle enough (low - energy conversion) to avoid disturbing sleep, aligning with criterion 2. For example, design B’s compressed spring has stored potential energy; if released abruptly, it might startle the user (interfering with sleep), so evaluating potential energy helps ensure the design meets this constraint.

Answer:

D. Blanket rolls quickly around roller when triggered by electronic timer