10 IA ideas using a ruler
1. Twanging (1) Clamp the ruler to the edge of a table and twang it (pull it down and release it). What is the relationship between the frequency and length? Assuming the ruler behaves like an oscillating spring leads to a predicted relationship. As the ruler gets shorter it's "spring constant" gets bigger but its mass gets smaller. The frequency could be measured from the sound it emits or by using a guitar pick up....