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Online Homeschool and the Secret to Lifting 100 Lbs. Using One Hand and Some Pulleys

If online homeschooling is your choice, I have some great activities for you that you will love. Here is one such activity where I teach you how to build your own pulley.

Hangar Pulley: Make a cut in the center of the base of the wire hanger (imagine cutting the base of a triangle). Now take a wooden spool of thread and thread it through one free end of the recently cut hanging wire (left to right) and bend the free end. Now take the other free end and pass it through the other side in a similar manner (from right to left) and bend the free end. Make sure the spool can rotate freely. You have now built the pulley.

 

Online homeschooling gives you the ability to work at your own pace, so you have to have some fun with the pulley. Attach the hanger to the ceiling hook. Take a basket and tie a strong string to its handle. Pass the rope over the pulley and pull on the loose end of the string to see if your pulley is working. Feel free to put different weights in the basket and try to pull the basket up by pulling the free end of the string.

 

Three pulley system: You can build this pulley system in your backyard or under your tree house to get food and other things into it. Attach two pulleys one above the other to the tree branch. Attach another S-hook pulley to the basket handle. Now take the rope and tie one end to the basket handle. Pull this rope over the top pulley and then over the basket pulley and then over the bottom pulley. Tie the loose end to the tube to make a handle.

 

The number of pulleys has changed on the effort you have to make to pull the object? Try pulling weights using the single pulley system. Now pull the same weight in your three pulley system. Do you have to use the same force?

 

You must have noticed that as the number of pulleys increases, less force is required to pull the same weight. Does it teach you anything about how to use multiple pulleys?

 

In the above experiment I used three pulleys. This means that the weight is distributed between all three pulleys, so you only use one-third of the effort to pull the weight. If the object to be lifted is 90 lbs, you will need to exert a force equivalent to 30 lbs to lift the object.

 

This is called a mechanical advantage or leverage. Mechanical advantage can be determined by counting the number of parts the ropes split into (not counting the part of the rope you pull). What is your online homeschool curriculum teaching you about mechanical advantages? Do you have access to any animations that demonstrate the same?

 

If the pulley system has four pulleys the rope is divided into four parts (except the part you hold). This means that the weight of the towed object is divided into four parts. So if you want to lift a 100-pound object, you’ll only need an effort equal to 25 pounds (100 ÷ 4). In conclusion, if you want to lift 100 pounds with one hand, you will need 4 pulleys. Isn’t that interesting?

 

Click the link below to get your free copy of “A Parent’s Guide to Science at Home” which is full of great science experiments and activities.

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