Mechanical advantage:
Class-I lever . . . can be any positive number
Class-II lever . . . always less than ' 1 ' (and more than zero)
Class-III lever . . . always more than ' 1 '
Move the focal point of the leaver.
The Class Lever for Pliers is a class 2 lever.
It is a third class lever.
A crane is a first class lever when it is winching in or out the rope attached to a load. The crane becomes 3rd class lever when it's boom is luffing, i.e. it is being lowererd or raised.
Class 1.
The distance from the fulcrum to the effort.
The mechanical advantage of a first-class lever depends on the relative distances between the effort force, the fulcrum, and the resistance force. The mechanical advantage is calculated as the ratio of the distance from the fulcrum to the effort force to the distance from the fulcrum to the resistance force.
The mechanical advantage of a lever is calculated by dividing the length of the input arm by the length of the output arm. In this case, the mechanical advantage would be 50 cm (input arm) divided by 40 cm (output arm), which equals 1.25. Therefore, the mechanical advantage of the lever is 1.25.
Here we don't always depend on the number but only the convenience of handling mechanically. First class. Fulcrum in the middle (scissors) Second class : Load is in the middle (nut cracker) Third class: Power is in the middle (forceps)
The mechanical advantage formula for a 1st class lever is calculated by dividing the distance from the fulcrum to the input force by the distance from the fulcrum to the output force. Mathematically, M.A = input arm length / output arm length.
second class lever
A wheelbarrow is a second-class lever. In a second-class lever, the load is between the effort (force) and the fulcrum, which allows for a mechanical advantage in lifting and moving heavy loads with less effort.
answer is 4
The mechanical advantage of a first class lever is calculated as the ratio of the effort arm to the resistance arm. In this case, the effort arm is 40 inches and the resistance arm is 10 inches, giving a mechanical advantage of 4:1. This means that the lever can multiply the input force by a factor of 4.
Second class lever. . . . Always greater than 1 . Third class lever . . . . . Always less than 1 . First class lever . . . . . Can be greater than 1 or less than 1 depending on position of fulcrum.
Class 1 and Class 2 levers always have a mechanical advantage greater than 1. In a Class 1 lever, the input arm is longer than the output arm, while in a Class 2 lever, the output arm is longer than the input arm, resulting in a mechanical advantage greater than 1.
In a first class lever, as the distance from the fulcrum to the point where the input force is applied increases, the mechanical advantage also increases. This means that the lever becomes more efficient at moving a load with less effort.