Conclusion
There are
several reasons why Calculus is important in physics.
Calculus will tell us that the potential energy of a
spring is equivalent to one-half the spring
constant times the displacement squared. It will tell us that momentum is
conserved. It will tell us that projectile motion looks
like a parabola (assuming acceleration is constant). In a
real world, objects do not behave linearly, and Calculus
is one of the best tools for showing why that is not so.
Maybe a lot of equations presented in this website is not
new to you. The purpose of this site is not to show new
equations: it's to show how these equations came to be,
from a theoretical aspect.
Now What?
There are still other important applications of Calculus in Physics. It is also used to explain the conservation of mechanical energy. It also explains why Newton's Law of Cooling behaves like an exponential function. After a while of theoretical research and careful observation, one can grasp a better understanding of the universe. So the next time you see a physics equation, see if you can use mathematical reasoning to understand how that equation came to be, and hopefully Calculus will be able to provide a solution.