A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way.
3; 2; 1
2; 1; 3
1; 2; 3
2; 3; 1
A class 2 lever always has a mechanical advantage, so let's rule out option 1. Now, a class 1 lever can have either a mechanical advantage or disadvantage depending on the positioning of the effort and load forces. However, a class 3 lever always has a mechanical disadvantage, which is not what we want. So, the correct answer is option 2; a class 2 lever always has a mechanical advantage. Hurray, we found a winner!
The correct order of the statements would be:
1; 2; 3
Explanation:
Lever classes refer to the arrangement of the fulcrum, load, and effort in a lever system. There are three classes of levers - Class 1, Class 2, and Class 3.
In Class 1 levers, the fulcrum is located between the load and the effort. This type of lever can go either way in terms of mechanical advantage. If the effort arm (distance from the fulcrum to the effort) is longer than the load arm (distance from the fulcrum to the load), the lever will provide a mechanical advantage. If the load arm is longer, the lever will have a mechanical disadvantage.
In Class 2 levers, the load is located between the fulcrum and the effort. A Class 2 lever always has a mechanical advantage. Examples of Class 2 levers include wheelbarrows and nutcrackers.
In Class 3 levers, the effort is located between the fulcrum and the load. A Class 3 lever never has a mechanical advantage. These levers are typically used to enhance speed or range of motion rather than strength. Examples of Class 3 levers include tweezers and fishing rods.
So, the correct order is 1; 2; 3. A Class 1 lever can go either way in terms of mechanical advantage, a Class 2 lever always has a mechanical advantage, and a Class 3 lever never has a mechanical advantage.
The correct order is:
3; 2; 1
This means that:
A class 3 lever never has a mechanical advantage.
A class 2 lever always has a mechanical advantage.
A class 1 lever could go either way.