An Inventory of Forces Encountered in Physics 1116 Below is a list of the forces that you will encounter in Physics 1116, with a basic description of how they act. You might be interested to know that, with the exception of gravity, all the other forces are actually examples of the electromagnetic interaction . They originate from the quantum-mechanical interactions of atoms and molecules (which consequently interact through the electromagnetic interaction, because electrons are negatively charged and the nucleus is positively charged; the gravitational forces between atoms is negligible). Type Manifestation How They Act & Limitations Tension Strings & Ropes Pulleys “Ideal” strings & ropes can transmit a tension, but can only “pull” and never “push” (i.e. tensions are always greater or equal to zero). The tension is always parallel to the string at all points, and its magnitude is constant at all points. “Ideal” pulleys serve to change the direction of the string and the
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