Force aligned in the same and opposite direction

Principle

On the one hand, the students should investigate the effect of two forces acting in the same direction on a mass piece; on the other hand, the effect of two forces acting in opposite directions on it.

From the comparison of the two measured force with the given weight (force) they should deduce the relationship among the 3 forces.

The term "(slotted) weight" is incorrect since we are dealing with a mass which becomes a weight (in reality "a weight-force") under the influence of the earth's gravity. The term "mass piece" used here is better.

Task

When can forces be added?

First you will investigate the effect of two forces acting in the same direction on a mass piece; then the effect of two forces acting in opposite directions on it will be studied. From the comparison of the two measured forces with the given weight (force) you should deduce the relationship among the three forces.

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