Is Work done when there is constant velocity?

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Homework Help Overview

The problem involves determining the work done while carrying a bag of textbooks horizontally at constant velocity. It is situated within the context of mechanics, specifically focusing on the concepts of work and force.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the relationship between work, force, and displacement, questioning whether work is done when moving at constant velocity. They explore the implications of zero acceleration and the net force on the bag.

Discussion Status

The discussion is ongoing, with participants raising questions about the nature of the forces involved and the conditions under which work is done. Some guidance has been offered regarding the interpretation of work in different directions.

Contextual Notes

Participants are considering the effects of carrying the bag both horizontally and vertically, and the implications of constant velocity on the work done. There is an emphasis on understanding the definitions and conditions of work in physics.

ericka141
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Homework Statement


"You carry your 14.0 kg bag of textbooks horizontally 1.8 m above the ground, at constant velocity for a distance of 25 m. Ignore wind resistance. How much work do you do on the bag in the process?"

Homework Equations


W=Fd
F=ma


The Attempt at a Solution


If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?
 
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ericka141 said:
If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?
The net force on the bag is zero. But what force do you exert and what work does that force do?
 
ericka141 said:
...If work equals force times distance...

W=∫F.ds
use that along with what Doc Al suggested.
:wink:
 
So is there only work being done in the vertical direction, aka. the force is takes you to physically hold the bag up?
 
If there's displacement in that direction, yes. Work is proportional to displacement.
 

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