With which class of levers is it possible to increase the force that must be applied?
Class 1 and 3
Class 1 and 3
Class 2 and 3
Class 2 and 3
Class 1 and 2
Class 1 and 2
Class 3 and 4
Class 3 and 4
The class of levers that can increase the force that must be applied is Class 2 and 3 levers.
To understand this, let's first understand the different classes of levers:
1. Class 1 lever: In this lever, the fulcrum is located between the applied force and the load. This lever does not provide any mechanical advantage in terms of force. Examples of Class 1 levers include a seesaw or a pair of pliers.
2. Class 2 lever: In this lever, the load is located between the applied force and the fulcrum. The fulcrum is still closer to the load compared to the force, which creates a mechanical advantage in terms of force. Examples of Class 2 levers include a wheelbarrow or a nutcracker.
3. Class 3 lever: In this lever, the applied force is located between the load and the fulcrum. The force is closer to the fulcrum than the load, resulting in a mechanical advantage in terms of speed and range of motion, but not force. Examples of Class 3 levers include tweezers or a fishing rod.
Now, coming back to the question, with Class 2 levers, the advantage is in increasing the force that must be applied. This is because the load is closer to the fulcrum, amplifying the force applied by the person operating the lever. For example, pushing down on the handle of a wheelbarrow allows you to lift a heavy load with less force.
While Class 3 levers do not directly increase the force applied, they increase the speed and range of motion. These levers have the force closer to the fulcrum, allowing for faster movements and a larger range of motion. However, they do not provide a mechanical advantage in terms of force.
So, the correct answer to the question is Class 2 and 3 levers.