Measurement of Forces in Physics - Comparison to an Arbitrary Agreed-Upon Unit

Measurement of Forces in Physics By Comparison to an Arbitrary Agreed-Upon Unit

1st experiment:
The effect of the weight hanged on a coil spring on the extension of the spring

2nd experiment:
The measurement of the weight of different objects with a calibrated spring

3rd experiment:
Intruduction of force units and the measurement of the Earth gravity force applied on an object by using a calibrated spring

4th experiment:
Measuring other forces than Earth's gravity.

Note:
There is a difference between mass and weight, but from a practical point of view, on Earth, they are the same. In order not to confuse physics beginners to whom this video is intended we avoided the use of the more correct term "mass" in some cases (only in the video) and replaced it by weight. We suggest that also teachers adopt this practice and defer some issues like mass vs. weight and units in general to a later stage.

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What are the independent parameters in your experiment with units (An independent parameter is one which you can control with a certain degree of precision )