Saturday, March 26, 2011

Experiment: How Much Effort?

"Forces and Machines" is our current unit in Science so we put some process skills to work and did some hypothesizing, predicting, experimenting, and inferring. We wanted to know how the position of the fulcrum affects the amount of effort needed to balance the load? We talked about a seesaw and the challenge of balancing the seesaw when one person is heavier than the other.

To begin our experiment we started with our fulcrum right at the 15cm mark on the ruler. Our "Effort" and "Load" cups each contained ten pennies.
We then altered the location of the fulcrum as you can see by our chart below. We had to add and take away from pennies from our "Effort" cup depending on the location of our fulcrum.

We worked together in groups to complete our experiment with the goal of being careful in our procedures.

Our observations were interestingly varied. However, we did conclude that the position of the fulcrum definitely affected the amount of effort needed to balance the load of pennies. We noticed that when there is more distance between the effort and the fulcrum, less effort is needed. More effort is needed when the distance is shorter. Therefore, if we have a lever to move a heavy object, we should place the fulcrum closer to the object and have more distance between the effort and the fulcrum.

No comments: