Use the arrow keys to start the puck in motion. The black arrows show the acceleration resulting from the force applied by the arrow keys. The pink arrow shows the velocity. If you start the puck in a purely horizontal direction, what do you need to do to cause it to move in a purely vertical direction? What do you need to do to make the puck move in a circular motion?
This is intended to help show 2-dimensional motion consistent with Newton's Laws.