What are the levers?

Your physics tuition is always exciting. Isn’t it? Have you ever heard the term leaver? If not, today your physics tuition will give you some insight on leaver. So, let’s start. We make use of knives, scissors, brooms, nut-crackers etc. in our daily life. All these items are simple machines. Such simple machines are called levers. In fact, a lever is a simple machine which is free to turn about a point. This point is known as the fulcrum. With the help of levers greater weight or resistance can be overcome by using less effort or force.

There are three classes of levers: Class I, Class II and Class III. Each type of lever has three points. The point where the lever is free to turn is called fulcrum. The second point is that at what point the effort is applied and the third is where the weight or resistance acts. The distance between the fulcrum and the weight is known as the load arm and the distance between the fulcrum and the effort point is called the effort arm.

The levers are divided into three classes on the basis of locations of these three points. Class I levers are those in which fulcrum lies between effort and the load. Scissors are an example of this class. The place where we insert our fingers is the effort point and that which cuts is the resistance point. The central point is the fulcrum. Crowbar, seesaw, balance, handle of hand pumped well, nail-cutter etc. are the examples of Class I levers.

In the Class II levers, weight lies between the fulcrum and the effort. A wheelbarrow and nutcrackers are the examples of this type.

In the Class III levers, effort lies between weight and the fulcrum. Plough and pair of tongs are the examples of this class.

In all the three classes, effort arm is longer than the weight arm. This gives them a greater mechanical advantage. We hope you enjoyed this lesson from physics tuition. We will be back with more such interesting findings in our next physics tuition.

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