Cars

Recently I was thinking about how I wanted a car and then I got to thinking about how a car really works and seeing as my dad is a car fanatic, he had taught me but it had never really occured to me as to the physics involved. The pistons in the engine are attatched to a crank shaft which is eventually attatched to the axle and it spins the wheels. But, to make the pistons in the cylinders move, physics is needed. First, the piston is closed almost all the way, and then a small amount of gas is sprayed into the cylinder. Then, the spark plug fires and ignites the gas, and as said in Boyle's law if the temperature increases and the volume remains the same, the pressure will decrease and the cylinder will open up, but then once opened, the heat from the explosion dissapates some and then the increased pressure will pull the cylinder back to the almost closed position. Or at least this is how I think it works.