Purpose: To prove that the first objectís distance multiplied by its mass equals the second objectís distance multiplied by its mass.
large (massive) object
Procedure: Choose a large object and two smaller objects to allow you to begin the experiment. The large object can be an adult, two kids, or a regular every day object. The two smaller objects should have approximately the same weight. Now using a bathroom scale, measure the mass of the large object and the two smaller objects. If the large one is composed of two smaller objects, add their masses together.
Mass of large object:
Mass of small object #1:
Mass of small object #2:
What happens when you move small mass #1 closer to the fulcrum? Which object is higher on the lever and which is lower?
Does the large mass need to be closer to or farther away from the fulcrum than the small mass to balance the see-saw?
1) What happens if the large mass and the small mass are equal distances from the pivot point?
2) If you want to seesaw with a grownup (who weighs much more than you do), where on the seesaw do you need to sit? Where does the grownup need to sit? Why?
3) How would you find out if, on a first-class lever, you and your friend weigh the same?
4) Can you think of a way you could use a lever like a seesaw to move something that is very heavy?5) Many playground seesaws have fixed pivot points. Are there any disadvantages to fixed pivot points?
This Page was last edited on Thursday, July 27, 2000 .