Equation of a quadratic

This sleek GeoGebra applet by Michael Borcherds provides practice in determining the equations of quadratic functions from their graphs. Some of the generated parabolas are easier to write equations for in factored form while others are easier to do in (h, k) form. All have leading coefficients of 1. After each function you type in, the function you have given is graphed for comparison with the original and you're told how many you've gotten right and the total amount of time it has taken you.

Vertical Motion Simulation

This GeoGebra applet by Linda Fahlberg-Stojanovska simulates the motion of a projectile fired either straight up or straight down on Earth in the absence of air resistance. The user sets the initial height and the initial velocity and indicates whether units of measure should be feet or meters. You see the motion of the ball along the vertical axis, while the height as a function of time is plotted for you.

Finding the equation of a parabola

This is an applet I created using Geogebra in which the user is asked to enter the equation of randomly generated parabola. The equation entered is graphed for comparison to the target parabola.