# Investigatory Project—Lever

Last Updated: 27 Jan 2021
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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. 2 E. Review of related literature

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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 bag closed, as you will need to add marbles in it. tape pencil to the edge of a table. Place your lever on the fulcrum. The bar of soap should be resting on the table, and the bag for the marbles should be dangling over the edge of the table. Position the ruler so that the length of the effort arm is 6 cm. You can use the markings on the ruler to measure 6 cm.

Add marbles to the bag, one at a time, until the bar of soap lifts off the table. Continue increasing the effort arm length by 2-cm increments until the measures 24 cm. Materials and Equipment •Metric ruler (preferably one that is stiff and has centimeter markings) •Plastic sandwich bag (1) •Tape (preferably masking tape) •Scissors •Pen or pencil •Bar of soap (still in its packaging) •Pennies (approximately \$3 worth; alternatively, marbles, beans, or some other small numerous item will work) •Lab notebook •Graph paper Experimental Procedure 1. 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. 2. Next you will need to construct a container out of your plastic bag to hold the pennies in. The bag and the pennies you'll place in the bag will be the effort. As you add more pennies, you are increasing the weight in the bag—and thus, the effort—until you eventually have enough effort to lift the soap bar (the load). a. Put a piece of tape approximately 1 centimeter (cm) from the zipper part of the top of a plastic sandwich bag.

Do this on both the inside and the outside of one side of the plastic bag. See Figure 2. a. below. b. Fold the taped section in half, width-wise. Using a pair of scissors, cut a slit long enough to allow the ruler to slip through. See Figure 2. b. below. c. Slip the free end of the ruler (the effort end) into the slit. Tape the bag to the ruler so it does not slide around. Be careful not to tape the bag closed, as you will need to add pennies inside it (the effort). 1. ncrease the length of the effort arm by 2 cm (total length should now be 8 cm) and repeat step 5 again.

Did it take more or fewer pennies to lift the load? Record your findings. 2. Continue increasing the effort arm length by 2-cm increments and retrying the experiment until the effort arm measures 24 cm. Don't forget to record all the data in your data table. 3. Analyze your data. You can make a line graph with the length of the effort arm on the x-axis and the number of pennies it takes to lift the load on the y-axis. Do you see a pattern? What happens when you double the distance? What happens when you quadruple the distance? To use the computer to make your graph you can visit the Create A Graph website. . You are trying to determine the relationship between two variables: the effort (# of pennies) it takes to lift the load (bar of soap) and the length of the effort arm, so choose the XY graph. b. Select the Data Tab, fill in: ?The graph title ?X-axis label (remember, the x-axis is the length of the effort arm) ? Y-axis label (remember, the y-axis is the number of pennies is takes to lift the load) ? In the Data Set box, tell the program you have 12 data points. ?For each point, fill in the length of the effort arm (x) and the number of pennies (y).