# Investigatory Project---Lever

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• Topic: Lever, Simple machine, Mechanical advantage
• Pages : 5 (1559 words )
• Published : January 19, 2012

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A more proficient use of lever: A heavier lift

Introduction
A.Background of the study

Buildings, infrastructures and a like were built using the help of machines. But have you ever ruminated how ancient structures like pyramids were built? Simple machines figured it out. Simple machines are any device that only requires the application of a single force to work. It is a tool used to make work easier. It gives mechanical advantage. This means that if you use a lever and the mechanical advantage it provides, you can lift an object that's much heavier than you are because the lever multiplies your effort. Lever, it is often used to move heavy loads with less effort. It is a rigid object that is used with an appropriate fulcrum point to multiply the mechanical force that can be applied to another object.

B.Statement of the problem

A study on the proficiency of lever in lifting heavy objects.

Specific Objectives

To build a tabletop lever and investigate how changing the length of the effort arm affects the amount of effort it takes to lift an object. •To discover other factors that can affect the proficiency of lever.

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E. Review of related literature

The following definitions are the terms and concepts regarding the said investigatory project.

Simple machines is any device that only requires the application of a single force to work. It is a tool used to make work easier.

lever magnifies force or velocity. It is often used to move heavy loads with less effort. It is a rigid object that is used with an appropriate fulcrum or pivot point to multiply the mechanical force that can be applied to another object.

Fulcrum , the support about which a lever turns.

Beam, The bar of a balance from which weighing pans are suspended. Parts of the lever (in the experiment, still undefined)
Effort end
Effort arm

*The First Class Lever, Second Class Lever and the Third Class lever. The only difference between them is the location of the fulcrum. *Levers help you move items that are very heavy. In the First Class lever the fulcrum is located in the middle. The load is on one end and the force is on the other. (crowbar) Second Class the fulcrum is on the end, the resistance force, the load, is in the middle, and the effort is at the other end. (wheelbarrow) The Third Class fulcrum is on the end of one side, the effort force is in the middle, and the resistance force, the load, is at the the top. (baseball bat)

*Levers are easy to spot because they help us in our lives. Some examples are: see-saw, claw hammer, crow bar, bottle opener, Piano keys, and car jacks.

Bibliography

Definition of terms:

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

http://encyclozine.com/science/physics/machines
http://encyclopedia2.thefreedictionary.com/simple+machine
http://www.thefreedictionary.com/beam

Methodology
A.Materials and equipment

Ruler (with centimetres)
Plastic bag