The everyday definition of work includes any useful physical or mental labor, while the scientific definition specifically involves force causing displacement.
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Yes, playing in a field can be considered work scientifically if it involves moving objects or oneself in response to applied forces.
Talking with friends, humming a tune, and watching a movie are seen as work in everyday life because they require mental effort but do not involve physical displacement.
Climbing a staircase involves force and displacement, meeting the scientific criteria for work, but in everyday life, work is often seen as productive tasks, not just physical exertion.
In science, work is defined as the force applied to an object causing its displacement in the direction of the force.