By touching the side of a beaker, a student concludes that an endothermic change is taking place inside it. write 2-3 sentences explaining how the student came to that conclusion and compare the energy products of an endothermic reaction with the energy of the reactants.

An endothermic reaction is a type of chemical reaction which absorb heat from the surrounding, because of this, the container of the reaction is always cold to touch. For an endothermic reaction, the energy of the products formed in the chemical reaction is always greater than that of the reactants, this is because additional energy in form of heat has been absorbed from the environment. 

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.