Static vs. Kinetic Friction: Why Does It Matter for Energy Conservation?

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The discussion revolves around the concepts of static and kinetic friction, particularly in the context of rolling objects and energy conservation. Participants are exploring the implications of friction on energy transformations and the conditions under which different types of friction apply.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning why static friction is preferred for rolling objects and the role of friction in energy conservation. There are attempts to clarify the differences between static and kinetic friction, particularly regarding their effects on energy.

Discussion Status

The discussion is active, with participants providing insights and clarifications about the nature of friction in rolling motion and its impact on energy. Some participants are exploring the nuances of how friction interacts with energy conservation, while others are seeking further examples or clarifications.

Contextual Notes

There appears to be some confusion regarding the effects of friction on energy conservation, with differing views on whether friction is ignored or accounted for in energy calculations.

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1. Why do we use static friction instead of kinetic friction for a rolling object?

2. Why do we ignore the effects of friction in the conservation of energy?
 
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nivek114 said:
1. Why do we use static friction instead of kinetic friction for a rolling object?

Because, even though a rolling object is moving, it isn't sliding across the surface.

nivek114 said:
2. Why do we ignore the effects of friction in the conservation of energy?

We don't. Friction turns kinetic energy into heat energy.


Need me to clarify or give examples of either answer?
 
1. The bottom of the wheel is not moving with respect to the ground at contact.
2. Since bottom of the wheel is not moving, the force does not move through a distance.
 
Right, I should clarify my second answer. Kinetic friction turns kinetic energy into heat energy. Static friction does not. sorry.
 

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