Rear Wheel Driven Car Rolling Friction

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Homework Help Overview

The discussion revolves around the concept of rolling friction in the context of a rear wheel driven car during acceleration. Participants are exploring the behavior of friction on different wheels and its relationship to the motion of the car.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the direction of rolling friction on the car as a whole and which wheel experiences greater friction. There is a discussion about the nature of friction in relation to motion and the conditions of pure rolling versus slipping.

Discussion Status

Some participants have provided insights into the nature of friction, particularly how it opposes slipping between surfaces. There is acknowledgment of a misunderstanding regarding the conditions of acceleration versus existing angular velocity. The second question regarding the magnitude of friction on different wheels remains open for further exploration.

Contextual Notes

Participants are navigating the complexities of friction in a dynamic scenario, with some focusing on the implications of acceleration and others on the definitions of motion and friction. There is an indication of varying interpretations of the problem setup.

pcdagr8
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if a rear wheel driven car is accelerated
i think...
1. on rear wheels friction is forward
2 on front wheels it is backward


my questions-
1.wats d direction of rolling friction on the car as a whole?(is dis question correct?)

2.which wheel will have greater magnitude of friction??
 
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friction is always in direction opposite that of motion.
 
denverdoc said:
friction is always in direction opposite that of motion.

going by your logic
You mean in pure rolling motion the friction should act backward??
 
friction opposes slipping between surfaces

A better way to describe friction is to say that it always opposes slipping between surfaces. Consider the rear tires. Without friction, they would just spin, slipping to the rear with respect to the road. Friction with the road opposes that slipping by acting towards the front. The friction accelerates the car forward, so friction and the car's motion are in the same direction.
 
Thanks Al, a nice explanation. I was only considering situation where there was already angular velocity and see now problem asks during acceleration. My bad.
 
Thanks Al !:smile:
but u haven't answered my second question...
please see if u can tell me something about it.
 

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