- any heavy object that can serve as a weight
- a stopwatch
1) First cut off the string as long as you want it.
2) Attach a weight to it (you can tie the string around it or tape it directly on to the object)
3) Hold the end of the string without the weight high enough so the weight is not touching the ground.
4) Make sure your string is straght.
5) Using your other hand, swing the weight either left or right.
6) Let go of the weight and have someone start the stopwatch and then stop it once the weight gets back to you.
7) Make a design that will allow your pendulum to swing ten times in ten seconds
8) If you are able to make a design that swings ten times in ten seconds redesign so your pendulum will go twice as fast (20 times) or twice as slow (5 times) in ten seconds.
The speed of the pendulum, called the "period," depends basically on two things: the length of the string and the mass of the object hung on the string. It's fascinating that the period does not depend on how far the thing is swinging—so if your pendulum swings just a centimeter or two, it should have the same period as if it swings much farther back and forth. Try this out yourself and see if it's true on your pendulum!