Can you lift a heavy weight using only your pinky finger? A lever (a bar that pivots on a fixed point) makes this possible. The secret is where you place the pivot.
You start by pounding a nail into a wooden stud. Try pulling it out with your bare hands. Then use a hammer as a lever and notice how much easier it becomes. The hammer's claw is the effort arm, and the nail is the resistance arm.
Next you set up meter sticks across plastic mugs as fulcrums (pivot points). You move the fulcrum to different positions and try lifting heavy weights with your pinky. The weight lifts easiest when the effort arm is longer than the resistance arm.
Hypothesis
The hypothesis is that it will be easiest to lift the weight when the resistance arm is shorter than the effort arm.
A lever is a bar that pivots on a fixed point. It changes how much force you need to lift something heavy. When the effort arm is longer than the resistance arm, you need less force. You can even lift a heavy weight with your pinky finger by placing the pivot in the right spot.
Can you lift a heavy weight using only your pinky finger? With the right setup, yes. A lever — a bar that pivots on a fixed point called a fulcrum — lets a small push move something much heavier. You start by pounding a nail into a wooden stud and trying to pull it out bare-handed. Then you use a hammer as a lever: the claw grips the nail, and pressing the handle becomes surprisingly easy. Next you set up meter sticks across plastic mugs as fulcrums and move the pivot to different positions along the stick. The weight lifts easiest when the effort arm is longer than the resistance arm.
Method & Materials
You will pound a nail into a 2x4 stud, try to remove the nail without using a hammer, and then use the hammer as a lever to remove the nail. You will also arrange the fulcrum, effort arm, and resistance arm in different ways to find out which arrangement makes it easiest to lift a weight.
You will need a hammer, a nail, a 2 foot long 2x4 stud, 10-12 meter sticks, 10-12 heavy weights, and 10-12 sturdy plastic mugs.
The results showed that it was easiest to lift the weight when the resistance arm was shorter than the effort arm. This observation stands out because it shows that the length of the lever can have a big impact on how easy it is to lift a weight.
Why do this project?
This science project is interesting and unique because it shows how the length of a lever can have a big impact on how easy it is to lift a weight.
Also Consider
Experiment variations to consider include using different lengths of the lever and using different weights.
Full project details
Additional information and source material for this project are available below.
