Force and reaction

Principle

1. The students should learn with the help of the spring balance that a force on a body can only be exerted when a counterforce acts on it simultaneously.

2. Using two spring balances, the students should experimentally determine that the forces on both spring balances are equally great, i.e. that force = counterforce (action = reaction).

Task

Does a spring balance need a retention force?

Two spring balances are connected via their measuring hooks to one another. The force that they exert on each other is measured at different distances.

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