Lever, bar, and mechanics why does this happen?

In summary, when using a lever, the distance between the fulcrum and the applied force affects the amount of effort needed to move an object. When the fulcrum is closer to the object being moved, as in the case of Beta, less effort is required to lift Alpha's hand. This is due to the concept of mechanical advantage, where a smaller force can be used to lift a larger load when the fulcrum is closer to the load. This can be explained by the equations of torque and work, which show that the length of the lever arm and the distance to the fulcrum play a significant role in the amount of force needed to move an object.
  • #1
John McDon
1
0
two saipens one known as Alpha who is on the left and the other on right Beta are present, Alpha first presses down on a bar and Beta has to use all of its strength to lift Alpha's hand a distance h a distance, in this scenario the fulcrum is placed close to Beta, now in the next scenario it is the opposite that Beta finds it very easy since the fulcrum is now closer to Alpha, why does this happen please give a detailed physics perspective for this concept for me to understand thanks!
 
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  • #3
John McDon said:
two saipens one known as Alpha who is on the left and the other on right Beta are present, Alpha first presses down on a bar and Beta has to use all of its strength to lift Alpha's hand a distance h a distance, in this scenario the fulcrum is placed close to Beta, now in the next scenario it is the opposite that Beta finds it very easy since the fulcrum is now closer to Alpha, why does this happen please give a detailed physics perspective for this concept for me to understand thanks!
Discussed here many times, search for "mechanical advantage".
 

Related to Lever, bar, and mechanics why does this happen?

1. What is a lever?

A lever is a simple machine that consists of a rigid bar or plank that is supported at one point, called the fulcrum, and used to transmit force. It allows for magnification or redirection of force.

2. How does a lever work?

A lever works by applying a force, called the effort, to one end of the lever to move or lift an object on the other end. The object being moved or lifted is called the load. The position of the fulcrum and the distribution of the effort and load determine the mechanical advantage of the lever.

3. What are the three classes of levers?

The three classes of levers are determined by the position of the fulcrum relative to the effort and load. In a first-class lever, the fulcrum is located between the effort and the load. In a second-class lever, the load is between the fulcrum and the effort. In a third-class lever, the effort is between the fulcrum and the load.

4. Why do levers allow for easier lifting?

Levers allow for easier lifting because they allow for the distribution of force over a longer distance. This means that less effort is required to move or lift the load. Additionally, the placement of the fulcrum can also contribute to the ease of lifting depending on the mechanical advantage of the lever.

5. What are some real-life examples of levers?

Some real-life examples of levers include seesaws, crowbars, scissors, and wheelbarrows. In the human body, our bones and muscles also function as levers to allow for movement and lifting of objects.

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