Here's simulation that let's you play with vectors in 2D.((Credit the [[http://phet.colorado.edu|PhET Team]] at the University of Colorado for the simulation.)) If the embedded simulation doesn't work, you can find it [[http://phet.colorado.edu/sims/vector-addition/vector-addition_en.html|on the PhET website]].
Here's simulation that let's you play with vectors in 2D.((Credit the [[http://phet.colorado.edu|PhET Team]] at the University of Colorado for the simulation.)) If the embedded simulation doesn't work, you can find it [[http://phet.colorado.edu/sims/vector-addition/vector-addition_en.html|on the PhET website]].