How do I find the amount heat energy generated from pushing a crate?

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Homework Help Overview

The discussion revolves around calculating the heat energy generated from pushing a crate with a specified force, mass, and distance while maintaining a constant speed. The subject area includes concepts from mechanics, particularly work and energy principles.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the application of the law of conservation of energy and question the forces acting on the crate when pushed at a constant speed. There is a discussion about the role of friction and its impact on energy dissipation.

Discussion Status

Participants are actively questioning the assumptions regarding forces involved and the relationship between work and kinetic energy. Some guidance is offered regarding the role of friction and energy loss, but no consensus has been reached on the method to calculate heat energy.

Contextual Notes

There is an ongoing discussion about the implications of friction as a non-conservative force and its effect on energy within the system. Participants are considering how to approach the problem given the constraints of constant speed and the forces at play.

pokeefer
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Homework Statement



A force of 120N pushes a crate of mass 15 kg along the ground at a constant speed of 3.2 m/s for a distance of 6.2m. What amount of heat energy was generated during this time?

Homework Equations



W = Fd
KE + PE = KE ' + PE '


The Attempt at a Solution



I don't know if the law of conservation of energy still applies somehow.
 
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pokeefer said:

Homework Statement



A force of 120N pushes a crate of mass 15 kg along the ground at a constant speed of

If its pushed at a constant speed what other force must be acting on the crate?
 
kjohnson said:
If its pushed at a constant speed what other force must be acting on the crate?

I'm guessing the force of friction.

But would I be able to solve for heat energy by:

Work = Change in kinetic energy

Then finding the initial kinetic energy and then

Ke Final = Work - Ke initial

Ke Final = Fd - 1/2 mv^2

?
 
Since friction is not a conservative force that means that energy is being dissipated or lost from the system. So you want to make the assumption that the energy lost because of friction is...
 

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