Why do we always talk about horsepower and torque? I. Horsepower: A unit of power from steam engines to internal combustion engines 1.1 The birth of horsepower: To replace the labor of horses 1.2 The essence of horsepower: A measure of power 1.3 The evolution of automobile horsepower: From single digits to thousands of horsepower II. Torque: The "rotational force" that drives wheels to rotate 2.1 Definition of torque: The force that makes an object rotate 2.2 The relationship between torque and horsepower: Two dimensions of power 2.3...