When a girl pulls a trolley, the trolley moves through a distance. The girl exerts a force on the trolley, and the trolley gets displaced. Therefore, work is done.
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The everyday definition of work includes any useful physical or mental labor, while the scientific definition specifically involves force causing displacement.
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.