Levers Quick Check
A class __ lever never has a mechanical advantage.
A class __ lever always has a mechanical advantage.
A class __ lever could go either way. (1 point)
1; 2; 3
3; 2; 1
2; 1; 3
2; 3; 1
1: A= 3:2:1
2: C= 3
3: B= Class 1 and 3
4: A= 600 J
5: A= 100 N
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Based on the given options, the correct answer is: 2; 1; 3
To determine which class of lever always has a mechanical advantage, we need to understand the different classes of levers and their characteristics.
There are three classes of levers:
1. Class 1 lever: In this type of lever, the fulcrum is located between the effort (input force) and the load (output force). Examples of class 1 levers include a see-saw or a crowbar.
2. Class 2 lever: In this type of lever, the load is located between the fulcrum and the effort. Examples of class 2 levers include a wheelbarrow or a nutcracker.
3. Class 3 lever: In this type of lever, the effort is located between the fulcrum and the load. Examples of class 3 levers include tweezers or a fishing rod.
Now, let's analyze the given options:
1. A class 1 lever never has a mechanical advantage. This statement is incorrect. Class 1 levers can have a mechanical advantage depending on the relative distances of the fulcrum, effort, and load from each other.
2. A class 2 lever always has a mechanical advantage. This statement is correct. In a class 2 lever, the effort arm is longer than the load arm, which results in a mechanical advantage.
3. A class 3 lever could go either way. This statement is also incorrect. Class 3 levers typically have a disadvantageous mechanical advantage because the effort arm is shorter than the load arm.
Therefore, the correct answer is:
A class 2 lever always has a mechanical advantage.