The classes taught at Tholostar University were open to the public, and Kobold John wanted to take the basic physics and chemistry courses.
"We can summarize the principles of dynamics starting with the second principle, which states that force has a linear dependence on the product of mass and acceleration:
F = m*a
I write the vectors in bold. Acceleration is the derivative with respect to time of velocity. If we are content to consider the mass constant over time, we can without difficulty write
F = m*(dv/dt) = [d(m*v)/dt]
The product m*v is the momentum p. Thus, we can write
F = dp/dt
It means that, if we have a variation in time of the momentum of a body of mass m, the latter depends linearly on the applied force. An isolated body not subject to forces keeps its momentum constant, and this is the first principle. In a system of bodies not subject to forces external to that system, there are only the mutual forces between the bodies, vectors with equal moduli and opposite directions, and this is the third principle."
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Kobold John & Pixie Dwight
FantasyKobold John and Pixie Dwight by Telemachus S. Physchlinson Humorous tales featuring two unlikely heroes. Daily life and great encounters with dragons, elves, wizards etc.
