Mobility and degrees of freedom

AI Thread Summary
Mobility and degrees of freedom are distinct concepts in mechanics, as outlined in the discussion. Mobility is defined by the equation Mobility = 3n - 2p1 - p2, while degrees of freedom is expressed as DOF = 3(N-1) - 2P - H. The variables represent the number of links (N), lower pairs (p), and higher pairs (H), with lower pairs including sliding, cylindrical, and spherical types. The confusion arises from differing definitions found online, which suggest they are the same. Understanding these equations and their components is crucial for clarity in mechanical systems.
morry
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Hi guys,

Just a quick question. In my lecturers notes, he has mobility and degrees of freedom as different things. With a separate equation for each.

However, when I went searching the net for some info because I couldn't understand the notes, I found it to be different.

The sites I found on the web, which look legit, say they are the same thing.

My lecturers notes say that Mobility = 3n-2p1-p2. And degree of freedom = MO -L.

I have no idea what that L means.

Can anyone explain this to me?
Thanks.
 
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define mobility
 
Degrees of freedom

Degrees of freedom is given by
DOF=3(N-1)-2P-H

N= number of links
p=numberof lowerpair
h=number of higher pair

lower pairs are sliding pair,cylindrical pair,spherical pair
higher pairs have only point contact.
eg;cam and follower
 

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