Calculating Friction Force on a Rotating Disk

Click For Summary
SUMMARY

The discussion focuses on calculating the friction force on a rotating disk, specifically when the rotary frequency doubles. The relationship established is F = 2N - 6, where F represents the friction force and N is the normal force. The acceleration can be derived from the angular frequency (ω), which is crucial for determining the friction force accurately. Participants emphasize the importance of understanding the dynamics of the system to solve the problem effectively.

PREREQUISITES
  • Understanding of Newton's Second Law (F = ma)
  • Knowledge of angular frequency (ω) and its relationship to linear acceleration
  • Familiarity with friction force concepts in rotational motion
  • Basic grasp of forces acting on a rotating object
NEXT STEPS
  • Study the derivation of friction force in rotating systems
  • Learn about angular acceleration and its effects on linear motion
  • Explore the relationship between normal force and friction in circular motion
  • Investigate real-world applications of friction in rotating machinery
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and rotational dynamics, as well as educators looking for examples of friction in rotating systems.

5Mystery
Messages
1
Reaction score
0

Homework Statement



The thing that is lying on the disk(Disko), is rotating together with disko. After the rotary frequency of disko grew twice (N X 2), friction(rubbing) Force grew F=6 ( F + 6). You have to understand friction Force module at the original frequency.


Homework Equations



I don't know. Probably, 2N = F + 6 : m X g

The Attempt at a Solution



2N = F6 : mg = F6 : 9,8
F = 9,8 : 6

but I don't think it is correct please help me. Sorry if there are some mistakes but I really need it please do not delete this post.
Thank you very much. :)
 
Physics news on Phys.org
Welcome to PF!

Hi 5Mystery! Welcome to PF! :smile:

The only horizontal force is the friction (and the only motion is horizontal).

So you can find the friction, F, by using F = ma.

So what is the acceleration (a), at an angular frequency ω? :wink:
 

Similar threads

Understanding Friction Between Two Disks: A Problem in Rotational Dynamics
  • · Replies 6 ·
Replies
6
Views
3K
Friction and Rotation: Understanding the Ratio of Forces on a Rotating Disk
  • · Replies 5 ·
Replies
5
Views
1K
Find the velocity of a rolling disk at time t
  • · Replies 18 ·
Replies
18
Views
2K
The normal force on a thin stick being lifted on a surface
  • · Replies 95 ·
4
Replies
95
Views
7K
Two Rotating Disks Contacting Along Edge
  • · Replies 2 ·
Replies
2
Views
2K
A disk on a slippy surface (Rotation and Translation)
  • · Replies 12 ·
Replies
12
Views
2K
Rubber on a rotating disk (angular velocity, forces)
  • · Replies 6 ·
Replies
6
Views
2K
Ball in Rotating Disk: Kinetic Energy, Work, and Power
  • · Replies 9 ·
Replies
9
Views
3K
Inclined disk rotating on the ground
  • · Replies 10 ·
Replies
10
Views
2K
Why Do Moments Balance in a Faraday Disk but Not the Forces?
  • · Replies 1 ·
Replies
1
Views
1K