Maximum friction force before slipping occurs

Click For Summary

Homework Help Overview

The discussion revolves around the concept of maximum friction force before slipping occurs, particularly in the context of a block on an inclined plane and a crate on a truck. Participants explore the definitions and implications of static friction and the conditions under which slipping begins.

Discussion Character

  • Conceptual clarification, Assumption checking, Exploratory

Approaches and Questions Raised

  • Participants discuss the relationship between the maximum frictional force and the normal force, referencing the equation f_s ≤ μ_sN. There are attempts to clarify the conditions for slipping, including scenarios involving inclined planes and the effects of increasing angles.

Discussion Status

The discussion has progressed with some participants providing clarifications and hints regarding the concept of slipping. There is an ongoing inquiry into specific scenarios, such as a crate on a truck, with participants encouraged to show their attempts before receiving further assistance.

Contextual Notes

Participants are navigating the implications of static and kinetic friction coefficients, as well as the effects of incline angles on frictional forces. There is an emphasis on the need for attempts to be shown in order to facilitate further discussion.

electricblue
Messages
5
Reaction score
0

Homework Statement



Hi guys, i am sort of confused with the concept of slipping. I got a question.. what does it mean by maximum friction force before slipping occurs?

Homework Equations



I believe in the use of f_{}s \leq \mu_{}sn

The Attempt at a Solution



please correct me if i am wrong. maximum friction force before slipping occurs = \mu_{}sn
 
Last edited:
Physics news on Phys.org
Hi electricblue! :smile:

(have a mu: µ and a ≤ and try using the X2 tag just above the Reply box :wink:)
electricblue said:
Hi guys, i am sort of confused with the concept of slipping. I got a question.. what does it mean by maximum friction force before slipping occurs?

please correct me if i am wrong. maximum friction force before slipping occurs = \mu_{}sn

Yes, if the force needed was any more (than µsN), then the force available wouldn't be enough, and so there would be slipping. :smile:
 
Hi electricblue,

To make you understand this concept, consider a block placed on an angled slope.

The block can either;

1. Slide (the frictional force exerted on the slope by the contact surface of the object < the force component due to gravity acting on the block parallel to the slope).

2. Remain stationary (the frictional force exerted on the slope by the contact surface of the object >= the force component due to gravity acting on the block parallel to the slope).

Let's say that the block originally remains stationary.

Now let's increase the angle of the slope. This has the same effect as to increase the force component due to gravity acting on the block parallel to the slope (You may find this easier to conceptualise if you draw a diagram).

There will come a point when the block begins to slide, that is, when the maximum frictional force between the contact surface and the block is overcome. This maximum frictional force is given by the equation you've stated, in words:

Maximum frictional force = coefficient of friction x normal force
 
Ok thanks! I got it now
 
I have been studying this concept of slipping now it gets me pondered..

what if i have a crate on a truck and the truck is suppose to climb up a hill of 20 degrees. mass of crate is 100kg and coefficient of static friction and kinetic friction is 0.4 and 0.5 respectively. the question is: What is the maximum acceleration the truck can have without the crate slipping?
 
Hi again electricblue,

You're going to have to show some attempt before we can help you.

Hint: Use N2L and also work out the maximum frictional force before slipping.
 

Similar threads

  • · Replies 20 ·
Replies
20
Views
2K
  • · Replies 97 ·
4
Replies
97
Views
6K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
6
Views
2K
  • · Replies 42 ·
2
Replies
42
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 9 ·
Replies
9
Views
1K
  • · Replies 4 ·
Replies
4
Views
2K