What is the relationship between force and displacement in determining work?

[Knav]

Hi . . . I was reading the answer to the question. . . "Why is carrying a bag and walking not considered to be work" . . . Just thought I'd add some relevant info to the answer for better clarity. . . . When a trolley with stuff is pushed, work is said to be done as the force is in the same direction as the displacement. . . . but. . . . . When carrying a bag and walking, the force is in the vertically upward direction while the displacement is in the horizontal direction . . . Since the force and displacement is perpendicular to each other and NOT in the same direction, it is concluded that no work is done.

 

[berkeman]

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