There has been SO much talk of HP and HP vs torque, it can make your head spin. Ive been trying to help with some clarification for those that seem to be very confused of the physics and concepts that i came up with a new "definition" to augment what is commonly read as the definition of HP. In my work in the auto Racing field, there are many enamored with the term "torque", often confusing it with the actual torque they care about, that of what is found at the rear tires (after the gear box). Because HP is the rate of doing work (basically means acceleration of a mas at any particular speed) or the rate of change of KE. ( again, acceleration of a mass). HP, should be synonymous or equivilant to saying, its " a body's capacity or ability to accelerate at any speed).. I thought of this when i remembered the definition of energy being a body's capacity to do work. Well, how fast you do that work is power, (rate of KE change) so hence the new definition. This way, it takes all the debate out of what HP really is... .Its not just a calculation. torque is not the "star" in most peoples minds for a vehicles ability to accelerate, it's power. Saying torque is the 'star" is like looking at work and saying the lever/distance is the star or weight/force is the star. Both are needed to know anything relevant. so, Horsepower IS " A measure of a vehicle's capacity to accelerate" thoughts?