The vibration of the ruler will produce a high or low sound depending on the force of the person strumming. Initial variable, force of strumming, dependent variable, sound produced, control variable, ruler (must be the same)
The vibration of the scale provides high and low sound based on the ejection force.<br>The first variable is the ejection force.<br>Sound based variables<br>Control variable scale (must be the same)
The vibration of the ruler will produce high or low notes, depending on the bit force of the bit.<br><br>Intensity variable<br>Variables generated by sound.<br>Ruler control variables (must be the same)