Mechanisms with Lower Pairs topics include: Lower pairs mechanisms, extracting straight line motionwith sliding pair, straight line and steering gear mechanisms. A lower pair is a pair where the connection between two elements is through the area of contact.  There are six types of lower pairs in spatial mechanisms: Spherical pair, Plane pair, Cylindrical pair, Revolute pair, Prismatic pair, Screw pair.  A spherical pair is a kinematic pair where one element of the pair is spherical and turns inside the other stationary element.  A higher pair is a kinematic pair in a mechanism that has... Show more

Mechanisms with Lower Pairs topics include: Lower pairs mechanisms, extracting straight line motionwith sliding pair, straight line and steering gear mechanisms.

A lower pair is a pair where the connection between two elements is through the area of contact. 

There are six types of lower pairs in spatial mechanisms: Spherical pair, Plane pair, Cylindrical pair, Revolute pair, Prismatic pair, Screw pair. 
A spherical pair is a kinematic pair where one element of the pair is spherical and turns inside the other stationary element. 
A higher pair is a kinematic pair in a mechanism that has two degrees of freedom (DOF). Higher pairs are more complex than lower pairs and involve non-contact interaction between elements. 

Some examples of higher pairs include:
A cylinder or sphere lying on a flat surface
The relative motion of a cam and follower
The point of contact between two involute gears meshing 

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