1. Is a force sensor a transducer? If so, what input does it take? (2 points)
2. List 4 applications of a piezo speaker. (2 points)
3. Explain how a relay works. (2 points)
4. What type of signal does an ultrasonic sensor use to determine the distance of an object? (1 point)
5. Is the ultrasonic sensor connected to the digital or analog pins of the Arduino UNO? (1 point)