Jump to content
Mechanical Engineering

is friction independent of Contact Area?

Recommended Posts

  • admin changed the title to is friction independent of Contact Area?
  • 3 months later...

It may seem strange but friction is independent of the actual area of contact. The reason behind this is that the actual area of contact on an atomic scale is a fraction of the total surface area.

Friction happens due to the interatomic forces at these minute regions of atomic contact. The fraction of the geometric area in atomic contact is proportional to the normal force divided by the geometric area. If the normal force is doubled, the area of atomic contact is also doubled and the friction becomes twice as large. But, if the geometric area is doubled whilst the normal force remains the same, the fraction of area in atomic contact is halved and the actual area in atomic contact hence the friction force remains constant.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Join Mechanical Engineering network

    Join us (login) to get full access : Please sign up to connect and participate.

    To download files...please login

  • Create New...