Question

The options show schematics of four different versions of a foot-operated hand sanitizer dispenser. Which schematic(s) will work as intended? 

• A. A
• B. B
• C. C
• D. D

Hint:

To verify the functionality of a mechanism, ensure that the force applied through levers or pedals is effectively transferred to perform the desired action without misalignment.

Answer 1

The Correct Option is A, B, D

1. Option A: The lever mechanism is correctly positioned, and pressing the foot pedal compresses the spring, effectively dispensing the sanitizer. Thus, \(A\) works as intended.
2. Option B: The spring mechanism is correctly aligned with the foot pedal and the sanitizer dispenser. Pressing the pedal transfers the force upward to dispense the sanitizer. Hence, \(B\) works as intended.
3. Option C: The schematic shows a misalignment of the lever mechanism. The foot pedal does not transfer the required force to the sanitizer dispenser. Thus, \(C\) does not work as intended.
4. Option D: The design has a proper lever mechanism and spring alignment. The force from the foot pedal is effectively transferred to dispense the sanitizer. Therefore, \(D\) works as intended.
Conclusion: The schematics that work as intended are \(A, B, D\).