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Give the different types of friction and explain each with an example.
 
a. Static friction describes the friction encountered by bodies that are at .
 
b. Kinetic friction is friction that occurs while bodies are .
 
c. The friction that exists between the surfaces in contact when one body slides over the surface of another is known as .
 
d. The friction that exists between the surfaces in contact when a body rolls over another is known as.