Solving Rolling Question Homework: Speed & Acceleration

  • Thread starter Thread starter Lord Dark
  • Start date Start date
  • Tags Tags
    Rolling
Click For Summary

Homework Help Overview

The discussion revolves around a problem in rotational motion, specifically involving a tire's rotation and the motion of a stone on its surface. The original poster presents a scenario where a tire with a specified radius rotates at a constant rate, prompting questions about the speed and acceleration of an object on its edge.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the implications of constant angular velocity on tangential and radial acceleration, questioning whether to calculate tangential or radial acceleration. There is an exploration of the relationship between angular acceleration and tangential acceleration.

Discussion Status

The conversation is progressing with participants clarifying concepts related to angular motion. Some guidance has been provided regarding the nature of acceleration under constant angular velocity, and there is a recognition of the distinction between tangential and radial components.

Contextual Notes

Participants are operating under the assumption of constant angular velocity, which implies zero angular acceleration. This context influences their approach to determining the relevant types of acceleration for the problem.

Lord Dark
Messages
120
Reaction score
0

Homework Statement


Hi again ,, my second one is easy:

A tire 0.5 m in radius rotates at a constant rate of 200 rev/min. Find the speed and
acceleration of a small stone stuck on the surface of the tire (on its outer edge).


Homework Equations





The Attempt at a Solution


the Speed of the rock is easy to get (W=200 rev/min = (20*pi)/3 rad/s = (10*pi)/3 m/s)
about the acceleration : should I get the tangent acceleration or the radial ??
 
Last edited:
Physics news on Phys.org
Constant angular velocity means that the angular acceleration is zero. So the tangential acceleration is zero.
 
so the question means i should get the tangent acceleration right not the radial one ?
 
Lord Dark said:
so the question means i should get the tangent acceleration right not the radial one ?

[tex]a_t = \alpha r[/tex]

[tex]a_r = \frac{v^2}{r}[/tex]


seeing as that [itex]\alpha=0[/itex], which one do you think you should find?
 
rock.freak667 said:
[tex]a_t = \alpha r[/tex]

[tex]a_r = \frac{v^2}{r}[/tex]


seeing as that [itex]\alpha=0[/itex], which one do you think you should find?

lol ,, got it :) ,, thanks ,, exam questions are so poor -_-
 

Similar threads

  • · Replies 12 ·
Replies
12
Views
2K
Replies
11
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
10
Views
2K
  • · Replies 1 ·
Replies
1
Views
4K
Replies
3
Views
5K
Replies
7
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
13
Views
2K
Replies
6
Views
2K