Lever
A lever is a simple machine. It consists of a rigid bar which is free to turn about a fixed point called fulcrum. There are three types of lever depending upon the position of load, effort and fulcrum. This note provides us with the information about lever, its use in practical life and types of lever with examples.
Summary
A lever is a simple machine. It consists of a rigid bar which is free to turn about a fixed point called fulcrum. There are three types of lever depending upon the position of load, effort and fulcrum. This note provides us with the information about lever, its use in practical life and types of lever with examples.
Things to Remember
- lever is a rigid bar, which is capable of rotating about a fixed point called fulcrum.
- The types of lever are First class lever, Second class lever, Third class lever.
MCQs
No MCQs found.
Subjective Questions
Q1:
Write an application to your principal about 3 days sick leave.
Type: Long Difficulty: Easy
Q2:
Write an application to the head of school management for scholarship.
Tips:
- You have a poor family, less earning.
- You are suggested to join a carpet industry to maintain the family.
- You’re studious, disciplined student and always securing good marks and holding 1st
- You won many prizes in extra- activities.
- Zeal to study.
- You have been winning scholarship regularly and because of it you’ve been able to continue your studies.
Type: Long Difficulty: Easy
Q3:
Write an application to the principal on the basis of the following points on the behalf of class X for an educational tour to Pokhara.
Tips:
- Collected Rs. 1000 each.
- Money is not enough, so provide bus and teacher including a lady teacher.
- The expenses of diesel will be made by them.
- It is part of education and beneficial to social study, health.
- Practical work of the school.
- Pokhara lies in the lap of Machhapuchhre and background of Annapurna.
- Beautiful spot, Gurung culture, rushing Seti river, Mahendra cave, Fewa, Begnas lake.
Type: Long Difficulty: Easy
Q4:
Write an application to the principal to give up all your bad habits and you’re going to concentrate in studies with all your power.
Type: Long Difficulty: Easy
Q5:
Write an application to the director in the P.O.B. 007 for the post of an English teacher.
Type: Long Difficulty: Easy
Q6:
Write an application in the board of director for the post of principal who has to work in the distant district. The ad was advertised in The Rising Nepal dated 10th Falgun.
Type: Long Difficulty: Easy
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Lever
A lever is a simple machine. It consists of a rigid bar which is free to turn about a fixed point called fulcrum. The weight to be lifted is the load and the force applied to the bar is called effort. The distance of the load from the fulcrum is called the load arm and the distance of effort from the fulcrum is called the effort arm.
There are three types of lever depending upon the position of the load, effort, and fulcrum. These are
- First class lever
- Second class lever
- Third class lever
First class lever
A first class lever is one in which the fulcrum lies anywhere between the effort and load. Examples: Crowbar, seesaw, scissors, pliers, beam balance, the handle of water pump, etc.
Second class lever
A second-class lever is one in which the load is between the effort and fulcrum.
Examples: Wheelbarrow, nutcracker, bottle opener, oar of a rowboat, etc.
Third class lever
A third class lever is one in which the effort is between the load and the fulcrum
Examples: shovel, sugar tongs, finger nut cutter, tweezers, human forearm, fork, fishing rod, etc.
Lesson
Simple Machine
Subject
Science
Grade
Grade 8
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