Which of the following is a lower pair?
A.
Ball and socket
B. Piston and cylinder
C. Cam and follower
Only A
Only
B
Only C
A
and B
A
and B
●Piston
and cylinder pair comes into lower pair category because there is surface to
surface (area) contact and also contact surface are similar. This is a type of
successfully constrained motion.
●Ball
and socket is a type of spherical pair also comes into the category of lowers
pairs mainly but it can be designed in way that it can also come into the
higher pair category.
●Cam
and follower comes into the category of higher pair, because they have point or
line contact between them.
Hence,
the correct option is (D).
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