Ketosis occurs when the body does not have any glucose stores left. So it has to switch to some other process to get energy. One process is gluconeogenesis in which the body creates glucose from fat/protein. The other is ketosis which is literally referes to the creation of ketone bodies from fat/protein.
C'mon Baby, Light My Fire. The ingredients needed to start a fire are traditionally illustrated in the fire triangle. The three legs of the triangle are fuel, oxygen and heat. When enough of these three factors is present, a chemical reaction occurs that results in fire. This is why you can start a fire with two sticks: The fuel is the sticks, the oxygen comes from the air and fiction provides the necessary heat. But this is far from the only circumstance in which friction starts a fire.
Cos if you throw them in a fire they will burn, of course the wooden part usually lights up at the same time so that's a chicken and egg type example. It would depend on the specific matches composition and structure as to what amount of friction energy will ignite it. And if you meant how hot is the flame on a match; that'll depend on the composition of the match head and the material used for the stick. So 'a high temperature' is the answer.