Physics — Types of Force
Contact and non-contact (field) forces.
Rendering…
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digraph Forces {
node [shape=box, style=rounded];
Forces -> Contact;
Forces -> "Non-contact (field)";
Contact -> Friction;
Contact -> Tension;
Contact -> "Normal reaction";
Contact -> "Air resistance";
"Non-contact (field)" -> Gravitational;
"Non-contact (field)" -> Electrostatic;
"Non-contact (field)" -> Magnetic;
}