This page enables you to experiment with the effects of friction and the spring constant in a spring-and-mass system. Click on the blue graph on the left side to see the effects of different values of these two constants. You can make finer changes by using the left-right arrows above the blue graph and the up-down arrows to the right of the blue graph. The smaller arrows change the values of the constant one pixel at a time. The larger ones change it more rapidly. The red curve on the right shows position and the blue curve shows velocity.