What Determines the Change in Thermal Energy of a Block Pulled Across a Surface?

AI Thread Summary
When a block is pulled across a surface at constant speed, the forces acting on it, including friction, are balanced, resulting in no net acceleration. This balance means that while kinetic energy remains constant, friction generates heat, leading to a change in thermal energy. Therefore, the correct conclusion is that there is a positive change in thermal energy due to the work done against friction. The initial assumption of zero change in thermal energy is incorrect. The discussion emphasizes the relationship between force, motion, and energy transformation in this scenario.
Westin
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Homework Statement



A block of mass M is pulled at constant speed with force F a distance d across a surface. Using the energy principle, what can you say about the change in thermal energy of the block?

a) [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmr10/alpha/144/char01.pngEtherm[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3C.png0 [/B]
b) [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmr10/alpha/144/char01.pngEtherm=0
c) [PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmr10/alpha/144/char01.pngEtherm[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3E.png0[/B]

Homework Equations

The Attempt at a Solution



I believe the change in thermal energy is 0 (b) because it is being pulled at a constant speed so nothing is actually changing. Is my logic correct to say it is b?

I only have one attempt left
 
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Of it's traveling at constant speed, then what can you say about the presence or absence of a friction force?
 
Chestermiller said:
Of it's traveling at constant speed, then what can you say about the presence or absence of a friction force?
If you are at constant speed, that means that the acceleration you are providing is equal to the deceleration from the friction. If those are not equal then the speed is increasing or decreasing. KE isn t changing. However, heat it formed so there would be a positive change of thermal energy? So C?
 
Westin said:
If you are at constant speed, that means that the acceleration you are providing is equal to the deceleration from the friction. If those are not equal then the speed is increasing or decreasing. KE isn t changing. However, heat it formed so there would be a positive change of thermal energy? So C?
Westin said:
If you are at constant speed, that means that the acceleration you are providing is equal to the deceleration from the friction. If those are not equal then the speed is increasing or decreasing. KE isn t changing. However, heat it formed so there would be a positive change of thermal energy? So C?
Correct.
 
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