What are examples or centripetal acceleration?

Centripetal acceleration is necessary, and is present, whenever any object
moves in a closed path, or along any part of a circular path.  Some examples
I can think of are:

-- a planet or a comet in orbit around the sun
-- a moon in orbit around a planet
-- the little ball making circles around the spinning roulette wheel
-- a stone tied to the end of a string, when you spin it around your head
-- the end of the spinning string on a weed-whacker
-- the tip of the blade of a fan or a windmill
-- any little bit of rubber on a car tire or bicycle tire, when they're moving
-- a strawberry seed spinning around the inside of the blender jar when you're
making a smoothie 
-- a car driving around a curve in the road
-- you on almost any amusement park ride;  whenever you're not moving in a
straight line, you're experiencing centripetal acceleration.

Amethod of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.