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Positive work

Positive work means that force (or its component) is parallel to displacement (Fig. 2)
 
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Fig. 2
 
Positive work signifies that the external force favors the motion of the body.

Negative work

Negative work means that force (or its component) is opposite to displacement (Fig. 3).
 
39212.png
Fig. 3
 
Negative work signifies that the external force opposes the motion of the body.




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