Two examples: tension in a rope and normal force. If you want to model the motion of an object with deterministic forces, it's fairly straightforward. Just use the following recipe.

One is tension force, found in stretched wires. Another is the force found in a spring. And last are resistive forces: friction, viscosity and drag. Find out more about contact forces.

Suppose I have a rope that is 4 meters long and I pull to the side with a force of 20 Newtons such that it is displaced 10 cm. Putting these values into the above expression, I get a tension force ...

In the absence of substantial B g, this tension force is much reduced. This leads to the eruptive behaviour shown in Extended Data Fig. 3, where the J T profile remains relatively uniform ...

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