Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law of inertia - states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Objects at equilibrium (the condition in which all forces balance) will not accelerate. According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing either its speed, its direction, or both its speed and direction.

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Newtons second law is actually written as...

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Or...

a = Fnet / M

(Thats what i was taught, not what they teach in schools now as it was rearranged to make it easier for students... it now looks like Fnet = M *x* A but it's still the same equation just rearranged...)

In this entire discussion, the emphasis has been on the net force. The acceleration is directly proportional to the net force; the net force equals mass times acceleration; the acceleration in the same direction as the net force; an acceleration is produced by a net force. The NET FORCE. It is important to remember this distinction. Do not use the value of merely "any 'ole force" in the above equation. It is the net force which is related to acceleration.

Using this law in comics is a bit weird as the full net force of any punch or kick for super strong people (Superman, Hulk, Supergirl... whoever) basically has the same force returned to them if they are impacting an object with more mass / volume than they have. (Again, not including speedsters or people that can change their density here)

So now to actually use this law / equation properly in comics we would actually have to work out the mass / density of each opponent and factor in the level of strength / speed used for each punch to work out the actual net force of any single punch / kick / impact...

Now, while I may do that for one or two battles that I'm really interested in, I'm not going to spend the time actually working out the net force of Superman's punches Vs The Hulk's head (Mass or density, take your pick there)

M

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