Pebble dropped on rotating wheel, starts to slide after rotation

Click For Summary

Homework Help Overview

The problem involves a pebble released on a rotating wheel, which begins to slide after the wheel has rotated through a certain angle. The context is centered around rotational motion and friction, with specific parameters provided for the wheel's radius and velocity.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants suggest drawing a force diagram and considering relevant equations. Questions are raised about the point of rotation for the pebble, its speed, the forces acting on it, and the conditions required to maintain its rotation without slipping.

Discussion Status

The discussion is ongoing, with participants exploring various aspects of the problem. Some guidance has been offered regarding the use of diagrams and the analysis of forces, but no consensus or definitive approach has emerged yet.

Contextual Notes

There is an indication that the original poster is struggling with the problem and has not attempted a solution. The nature of the problem suggests that assumptions about the motion and forces involved are being critically examined.

zibs.shirsh
Messages
4
Reaction score
0

Homework Statement


A wheel of radius R=50cm rolls along the ground with velocity V=2m/s. A pebble released on top of the wheel so that it is instantaneously at rest on the wheel. The co-efficient of friction between wheel and pebble is μ=1. The pebble starts to slide down when it has rotated through angle θ with the vertical axis.

Calculate θ.


Homework Equations


Absolutely No idea


The Attempt at a Solution


Couldn't attempt
 
Last edited:
Physics news on Phys.org
Try drawing a force diagram. This always helps. I am sure you can think of some relevant equations.
 
I assume it means at rest relative to the point on the wheel where it is placed.
When the wheel has moved through an angle theta (with the pebble not having slipped yet):
- what point is the pebble rotating about?
- how fast is it moving?
- what force is required to keep it rotating about that point?
- what forces act on the pebble, and in what directions?
 
I assume it means at rest relative to the point on the wheel where it is placed.
When the wheel has moved through an angle theta (with the pebble not having slipped yet):
- what point is the pebble rotating about?
- how fast is it moving?
- what force is required to keep it rotating about that point?
- what forces act on the pebble, and in what directions?
 

Similar threads

Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
3
Views
3K
Replies
19
Views
3K
  • · Replies 26 ·
Replies
26
Views
6K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 19 ·
Replies
19
Views
5K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 15 ·
Replies
15
Views
5K