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For example, if the track in Figure 4 2 is hori- zontal, carts move along its length without slowing down appreciably In other words: In the absence of friction, objects 

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Cory : I remember, in high school, being amazed at how quickly carts could travel on these tracks - air would blow up through these tiny holes evenly distributed along the length of the track and the cart would essentially float on the air and consequently - the cart would move very quickly with the slightest push. Alison : Although there is no way to create frictionless surfaces, I find it interesting that we consider experiments "in the absence of friction." In a wa y, this relates back to Chapter 1.5 where we talked about the importance of having too little or too much information in our representations. In some cases, the friction is so insignificant that we ignore it (simplifying our representation). Beth: Does this only apply to solid surfaces? I feel as if a sub- st ance that floats on water either has negligible or very little friction.

Cory : Why is this? I don't get it.

Alison : I believe this applies to almost every surface, although I'm not sure if water would count more as resistance than friction. Anyways, the best example I could think of would be a surf board. If people who were paddling in the same direction as the waves experienced no resistance, they would continually speed up, and eventually reach very high speeds. Howeve r, in reality if they were two stop paddling they'd slow down and only the waves would slowly push them to shore. Beth: Is it possible to have a surface, in real life, that inflicts NO friction at all? Beth: Doesn't air resistance factor into this at all? Alison :The key word is "appreciably". In the absense of friction, the cart does not slow down appreciably but still would a little due to air resistance Cory: a) yes b) concrete has the acceleration of greatest magnitude Beth: I would think that they are not constant because if we think of the formula F=ma, the force of friction is di fferent in every case. : Alison:As a theoretical question about inertia, if an object in motion will stay in motion, but is being a ffected by friction, will it slow down perpetually but remain in motion, or will it eventually stop completely due to the friction? Just curious. Beth: With friction everything slows down to a half at one point or anothe r. It is only if an outside force acts on the object if that object will maintain motion after the e ffects of inertia. Cory: Standard carts: identical carts in mass, shape, etc. I like this notion of standard carts, it provides a good baseline to compare other motion and to understand the concepts before building on it. Cory: Great visual representation of friction! It is interesting how this compares the velocity of things on di fferent surfaces Alison : : The rougher the surface, the more friction between the surface and the wooden block, and thus acceleration will be greate r.

CONCEPTS

4.1 Friction

Figu re 4.1 Figu re 4.2 4.1

4.2 Inertia

the entire assignment and submitted on time), they would obtain the fol lowing evaluations for their body of annotations:

Meets expectations

synthesis of multiple concepts. His responses are thoughtful explanations with substantiated claims and/or concrete exam

ples.

He also poses a profound question that goes beyond the material covered in the text. Finally, he applies understanding

of graphical representation to explain the relationship between concepts.

Improvement needed

: While Beth asks possibly insightful questions, she does not elaborate on thought process. She demonstrates superficial re

ading, thought but does not really address the question posed.

Deficient

questions do not explicitly identify points of confusion. Moreover, his annotations are not backed up by any reasoning or

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