Help a HS teacher understand uniform motion?

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  • Thread starter Thread starter William Ray
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SUMMARY

The discussion centers on the misconception that an object at rest is not in uniform motion. Participants argue that constant zero velocity qualifies as a constant velocity, thus placing an object at rest within the category of uniform motion. They emphasize that velocity is a relational concept dependent on the observer's reference frame, and that zero velocity should not be treated as a unique state. The conversation highlights the need for clear definitions and understanding of fundamental physics principles to prevent the propagation of incorrect teachings in educational settings.

PREREQUISITES
  • Understanding of Newton's First Law of Motion
  • Familiarity with the concept of velocity as a relational property
  • Basic knowledge of inertial reference frames
  • Awareness of the implications of constant velocity versus acceleration
NEXT STEPS
  • Research the implications of Newton's First Law in different inertial reference frames
  • Study the concept of velocity in classical mechanics, focusing on constant and zero velocity
  • Explore the principle of relativity and its impact on motion perception
  • Examine common misconceptions in physics education and strategies to address them
USEFUL FOR

Physics educators, students studying classical mechanics, and anyone interested in clarifying misconceptions about motion and velocity.

  • #61
Chestermiller said:
Thanks. I agree. Apparently William Ray and Spinnor don't get the idea that, if you put a thermometer in a bucket of ice water, the temperature you measure will be 0C.

[edited]
I'm not sure where you get the impression that I don't get that idea. I don't believe anyone's disagreeing with you that the surface of the ground will not exceed 0C. I also don't see why you think this is relevant to the question you asked. You are aware that the temperature of the air, (as well as the black-body temperature of the night sky, though it seems we're mostly ignoring radiation here), are significantly below 0C for much of the winter, in many parts of the world?

If you can find anything in what I've said that suggests that there is not an upper limit to the temperature that the sub-snow ground can attain, I'll eat my shorts. Otherwise I believe you're off base here.
 
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  • #62
William Ray said:
[edited]
I'm not sure where you get the impression that I don't get that idea. I don't believe anyone's disagreeing with you that the surface of the ground will not exceed 0C. I also don't see why you think this is relevant to the question you asked. You are aware that the temperature of the air, (as well as the black-body temperature of the night sky, though it seems we're mostly ignoring radiation here), are significantly below 0C for much of the winter, in many parts of the world?

If you can find anything in what I've said that suggests that there is not an upper limit to the temperature that the sub-snow ground can attain, I'll eat my shorts. Otherwise I believe you're off base here.
I'm very sorry. Please forgive me. This is all my misinterpretation of what you were saying.

Chet
 
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  • #63
Chestermiller said:
I'm very sorry. Please forgive me. This is all my misinterpretation of what you were saying.

Chet

Delighted to hear it! I'd hate to think that one or the other of us had gone insane :-)
 
  • #64
lol what of the blanket of snow keeping the ground cold,

Given "mother in laws" reasoning a thicker blanket would maintain the delta in temps better. I'm sure Canadian golf courses have plenty to say about snow blankets.

I would also imagine the average ground temp has a huge influence on this. I think it might be called "frost depth". The ground where I live is probably only frozen a couple of meters down at it's peak...now does the blanket maintain the frost or protect it from going deeper?
 
  • #65
I’m confused. Is the snow blanket at rest, uniform motion, or non-uniform motion? o0)
 

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