# Investigatory Project---Lever

Topics: Lever, Simple machine, Mechanical advantage Pages: 5 (1559 words) Published: January 19, 2012
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
Scissors
Pencil
Soap box with soap in it
Marbles (in same sizes)
B.Procedure
To start this project, you will need to build your lever. The ruler will be the beam for the lever. Tape a bar of soap to one end of the ruler. The soap is the load you will be trying to lift. Next you will need to construct a container out of your plastic bag to hold the marbles in. The bag and the marbles you'll place in the bag will be the effort. As you add more marbles, you are increasing the weight in the bag and thus, the effort until you eventually have enough effort to lift the soap bar. Put a piece of tape approximately 1 centimeter (cm) from the top of a plastic bag . Fold the taped part in half. Using a pair of scissors, cut a slit long enough to allow the ruler to slip through. Slip the free end of the ruler into the slit. Tape the bag to the ruler so it does not slide around. Be careful not to tape the...