Hey, So I am a sophomore in high school and have never taken a physics class before (it hasn't been offered) but I look forward too taking one. I got really thoughtful today and came up with three questions. 1. Gravity... is it energy? And is it infinite? I mean we harness gravities energy in things like water turbines. Gravity makes the water move and turbines turn it into electricity. What does this mean? 2. Is cold really the absence of energy? Can it be harnessed? The reason I ask is their is some sort of theory I heard and i might be terribly simplifying but basically "everything moves to a state of chaos without the input of energy". Now I know cold means particles are not moving as much but could that only be a lack in kinetic energy? For example cold moves water which is in a turbulent state into a more organized crystalline structure. Now I know hydrogen bonds cause the crystal structure but it that all the energy that goes into making that happen? 3. Are magnets infinite energy. I mean they seem pretty long lasting to me and push away other things in a kinetic form... What is this? If we somehow managed to get two massive focused magnets and force them into each other to the point where they were touching... could we harness energy from that? Specifically the magnetic resistance? Thanks so much for reading! Pardon my stupidity and lack of lingo/vocab on these things.