Fig. 8.41 represents the velocity-time graph for a lift in a department store
a) Briefly describe the motion represented by OA AB, BC on the
b) Use the graph to calculate the (1) acceleration of the lift and
the total distance travelled by the lift​

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Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.

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