How do biomass and energy flow through an ecosystem?

Productivity within an ecosystem can be defined as the percentage of energy entering the ecosystem incorporated into biomass in a particular trophic level. Biomass is the total mass, in a unit area at the time of measurement, of living or previously living organisms within a trophic level.

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Two children pulling apart a wishbone is the best example of a force counteracting Fp, because it involves the two children exerting a force in opposite directions. Instances of using a dolly to push a box to another location, a group of dogs pulling a dogsled across ice, two people pushing a broken-down car up the road involve exerting force in the same direction, so they are not examples of a force counteracting Fp.