This applet simulates the oscillation of a spring.
You can vary the mass and the spring constant.
Click anywhere in the applet to start the spring oscillating.
If the applet does not appear, please try the following:
(1) Download the Java software from www.java.com.
(2) Go to the menu: Tools > Turn off Pop-Up Blocker.
(3) Tools > Internet Options > Advanced > Security > Allow Active Contents.
(4) Start Menu > All Programs > Java > Configure Java > Security and then add this website to the Exception Site List.

The period of oscillation T of a spring is given by:
T = 2 π m

where m = mass and k = spring constant.

As mass increases, period increases.
As spring constant increases, period decreases.

Right-click here to download this page and the Java Class File.