Use the HCSR-04 ultrasonic sensor to measure force. Led your students build their own force sensor and learn the principles of sound propagation, and reflection, hook's law, and instruments calibration. Use the sensor made to measure the force in other lab activities. Cultivate creativity, and ingenuity by letting the students make their own designs, using different materials and their own designs. Learn how to use the arduino board to collect data in the physics lab.