If there’s one topic in Physics that every student generally learns and retains for life, it’s Newton’s 2nd Law:

Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.The relationship between an object’s massm, its accelerationa, and the applied forceisFF= ma.

Different teachers require students to perform this basic calculation to varying levels of complexity- namely converting between various types of units/measurements.

Here’s a great online flash-based calculator that can find any one of the variables, by providing the other two. In addition, it outputs results in multiple units, doing the conversion for you.

If you’re looking to determine the corresponding forces due to gravity and/or friction for a block on a ramp or object sliding down an incline, this tool helps solve the problem, while showing all the steps in the various calculations and displaying a fully labeled free body diagram.

- Inclined Plane Normal, Friction, and Applied Force Calculator
http://www.thecraftycanvas.com/library/incline-force-calculator-problem-solver.html

In the case you need to convert from Newtons (N) to another unit of force, meters per second squared (m/s^{2}) to another unit of acceleration, here’s a great page listing all the conversion factors.