A child rides a carousel with a radius of5.1 that rotates with a constant speed of2.2 m/s. Calculate the magnitude of the centripetal acceleration of the child.

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other