Is Work Done While Walking Without External Force Applied?

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Homework Help Overview

The discussion revolves around the concept of work in physics, specifically in the context of walking without external forces applied. Participants explore whether internal energy from the body contributes to work done during walking.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the definition of work as the product of force and displacement, questioning if internal energy contributes to work while walking. There are inquiries about the differences between walking and other forms of motion, such as rolling or sliding. Some participants also raise questions about the efficiency of walking and the mechanics involved, including the role of arm movements.

Discussion Status

The discussion is active with various perspectives being shared. Some participants provide insights into the mechanics of walking and the energy involved, while others seek clarification on the calculations of force and work done. There is no explicit consensus yet, as multiple interpretations and questions are being explored.

Contextual Notes

Participants are considering the implications of walking efficiency and the mechanics of human movement, with references to the work-energy theorem and the role of muscle contractions. There is an emphasis on understanding the definitions and calculations related to work in this context.

shehri
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Hi all,

Work,in terms of Physics, is defined as F.d i.e scalar product of Force & displacement.My query is "While walking are is some work is done by our body if no external force is applied on our body?.Is some work is being done by the internal energy supplied by our body?.Thanks.
 
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do you mean "is any work done while walking?"
the answer is definitely yes. You push the Earth so that the Earth pushes you while working. The energy goes into frictional heat, kinetic energy of the earth, of your body, and the gravitational potential you build up when lifting you, also electrostatic potential between the ground and you... and many many more...

also, if you look at the muscles cells of the body, they contract and relax during walking, which requires chemical energy from ATPs and many others things.
 
Well. I'll need to be scientifically detached here for several reasons. Sigh.

To the original post/poster (OP) -- what are the differences between a human female walking versus a cylinder rolling or a mass sliding on a frictionless plane?

Sigh again. Anybody want to work out?
 
yes, I meant while walking, is some work is being done in terms of 'F.d'?If yes,how the force 'F' will be calculated?.If someone travels 5m what would be the work done in terms of definition of work i.e,

w=F.d.
 
As I was hinting, walking is less efficient than rolling. Why is it less efficient? What percentage of our leg motions are actually propelling us forward? What do you have to do with your arms to stay balanced? Does swinging your ams produce useful work in walking?
 
shehri said:
yes, I meant while walking, is some work is being done in terms of 'F.d'?If yes,how the force 'F' will be calculated?.If someone travels 5m what would be the work done in terms of definition of work i.e,

w=F.d.
Use the work-energy theorem. If you walk at constant speed over some distance, what is the net work done on you?
 

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