Frictional force and Normal force

  • #1
manimaran1605
60
0
when a body is slided or move in a horizontal floor, the Frictional force is directly proportional to the Normal force acting on the body. Is there is any proof (emperically or Theoretically)
 

Answers and Replies

  • #2
arildno
Science Advisor
Homework Helper
Gold Member
Dearly Missed
10,089
135
Yes. bundles of it, experimentwise.
 
  • #3
dauto
1,948
201
It is an empirical relationship
 
  • #4
arildno
Science Advisor
Homework Helper
Gold Member
Dearly Missed
10,089
135
To be specific, the local frictional force has been establish to be proportional to the local point pressure.

This point pressure, roughly equals N/A, where N is normal force, A is area, so that the frictional FORCE equals k*(N/A)*A=kN, for k constant of proportionality.
 
  • #5
HallsofIvy
Science Advisor
Homework Helper
43,021
970
In fact, like most simple physics laws, it is a "first order" approximation. Any "reasonable" (analytic) function can be written as a power series, f(x)= a+ bx+ cx^2+ .... Obviously, if there were NO normal force holding object to surface, there is no friction so a= 0. Approximating the function by its linear approximation, f(x)= bx so f is proportional to x to the first order in x.
 
  • #6
rcgldr
Homework Helper
8,791
579

Suggested for: Frictional force and Normal force

Replies
9
Views
188
Replies
2
Views
419
Replies
12
Views
429
  • Last Post
Replies
9
Views
354
Replies
12
Views
367
Replies
3
Views
913
Replies
18
Views
301
  • Last Post
Replies
12
Views
351
Replies
4
Views
280
  • Last Post
Replies
1
Views
159
Top