Understanding Tangential vs. Radial Acceleration on Rotating Bodies in Physics

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Homework Help Overview

The discussion revolves around understanding the concepts of tangential and radial acceleration in the context of rotating bodies, as well as exploring the relationship between tire pressure and contact area with the pavement. Participants are also examining the distinctions between translational and rotational motion.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to clarify the definitions and differences between tangential and radial acceleration. There are inquiries about how tire pressure affects the contact area with the ground. Additionally, questions are raised regarding the effects of a force on both translational and rotational motion.

Discussion Status

Some participants have provided insights into the relationship between tire pressure and contact area, suggesting that the physical behavior of tires under different pressures leads to observable changes. Others are exploring the nuances of how forces can influence both types of motion, indicating a productive exchange of ideas without reaching a consensus.

Contextual Notes

There are mentions of differing technologies in tire design that may affect the relationship between pressure and contact area, as well as the need for clarity on the definitions of motion types in physics.

9danny
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What is the difference between tangential and radial acceleration for a point on a rotating body? :rolleyes:
***
Also, and this is mainly for a personal inquiry trying to get a "physics-oriented" answer...
I've noticed that the lower the tire pressure the greater the contact area between the tire and the pavement... why?
 
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Draw a circle. Now label the tangential and radial directions. Remember, orthogonal (different by 90 degrees) components cannot affect each other directly.

About tire-pavement surface area versus tire pressure: there probably isn't a "physics-oriented" answer. It's just a simple observational fact that, if you lower the pressure, the tire tends to 'slump' more and because of that, there is more of it touching the ground.
 
mezarashi said:
About tire-pavement surface area versus tire pressure: there probably isn't a "physics-oriented" answer. It's just a simple observational fact that, if you lower the pressure, the tire tends to 'slump' more and because of that, there is more of it touching the ground.

Actually:
For an air-pressure based tire - like normal bycicle - the area of the tire that touches the ground is goint to be equal to the weight that the tire is carrying divided by the pressure in the tire.

Modern car tires use a somewhat different tenchology where a non-trivial amount of the weight is carried by the side walls of the tire, and, as a consequence, the area that makes contact with the ground is affected less by the air pressure in the tire.
 
also related to rotational motion... a concept that I can't grasp entirely...
can a simple force applied to a body change both its translational and the rotational motion?
I thought they were the same thing...
 
9danny said:
also related to rotational motion... a concept that I can't grasp entirely...
can a simple force applied to a body change both its translational and the rotational motion?
I thought they were the same thing...

Rotational and translational motion are not the same thing.

Consider:
A stationary bycicle wheel has no rotational or translational motion.
If you lift it by the axle, a bycicle wheel could be spinning in place with rotational, but no translational motion.
A bycicle wheel on the back of a moving truck will have translational, but not rotational motion.
And, if you're riding the bycicle, it will have both rotational, and translational motion.
 

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