The Graphs of Quadratic Equations

Use the sliders labeled a, b and c to move the parabola around the coordinate grid. Keep in mind that the Standard Form of a Quadratic Equation is ax^2 + bx + c. Understand that the sliders a, b and c correlate with the variable a, b and c in the equation.
What happens to the parabola when you move the slider a? What happens to the parabola when you move the slider b? What happen to the parabola when you move the slider c?