Exploring Newton's Third Law: Rope with a Wheel & Work/Potential Energy

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Homework Help Overview

The discussion revolves around Newton's third law, specifically in the context of a rope and wheel system, as well as concepts related to work and potential energy. Participants are examining the implications of forces applied in these scenarios.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the reaction force when a 50N force is applied in a rope and wheel setup. They also pose questions about the nature of work done and the relationship between the force applied and the weight of an object being lifted.

Discussion Status

Some participants are seeking clarification on the original poster's description of the rope and wheel scenario. There is an ongoing exploration of the nature of forces in work and potential energy contexts, with no explicit consensus reached yet.

Contextual Notes

Participants are questioning the assumptions about the forces involved in lifting weights and the nature of work done, indicating potential gaps in understanding or missing information regarding the setup.

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One question related to Newton's third law,
v
t p
u o
u o
It is a rope with a wheel,v.
If 50N is applied from u pulling towards the ground, what's the reaction force?
From o to p ?

Two questions related to work,
I think the force in the equation of work done is continuously applied,like weight, right?
And the object would not stop finally, right?

For the PE, a weight of 100N is lifted up by a man up to a height of 10m.
Why the force applied by the man continuously is 100N?
Isn't 100 N causing no effect on the weight as it is compensated by the mg of the weight, right?
 
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"One question related to Newton's third law,
v
t p
u o
u o
It is a rope with a wheel,v.
"
What does this mean?
 
:confused: :confused:
 
How about these?
Two questions related to work,
I think the force in the equation of work done is continuously applied,like weight, right?
And the object would not stop finally, right?

For the PE, a weight of 100N is lifted up by a man up to a height of 10m.
Why the force applied by the man continuously is 100N?
Isn't 100 N causing no effect on the weight as it is compensated by the mg of the weight, right?
 

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