How To Build A Crane Grade 7

Building a crane is a fun and educational project for Grade 7 learners. It helps students understand how machines work and teaches concepts such as force, balance, levers, and pulleys. Cranes are used to lift and move heavy objects, and creating a simple model allows learners to explore engineering in a hands-on way. You do not need expensive materials to build one—simple items like cardboard, string, and sticks can be used. Here is how to build a crane Grade 7.

1. Understand How a Crane Works
   Before you start building, it is important to know how a crane functions. A crane uses a combination of levers and pulleys to lift objects that are too heavy for people to carry. The pulley helps reduce the force needed to lift something, while the lever and base provide balance. Understanding this concept will help you build a crane that works properly and can lift small objects without tipping over.
2. Collect Materials and Tools
   You can build your crane using simple materials found at home or in the classroom. Gather items such as cardboard, wooden sticks or straws, string, paper clips, and a small weight like a rubber or metal washer. You will also need glue, scissors, tape, and a ruler. If you want your crane to be stronger, you can use pieces of wood or thick plastic instead of cardboard.
3. Build the Base of the Crane
   Start by making a strong base to support the crane. Cut a piece of cardboard into a square or rectangular shape. This will serve as the foundation to hold the structure steady. You can glue or tape extra layers of cardboard together to make it more stable. The base must be strong enough to support the crane’s arm when it lifts objects.
4. Make the Crane Arm and Tower
   Next, build the tower that stands vertically on the base. You can use a long stick, straw, or rolled-up piece of cardboard for this. Glue or tape it firmly to the base so it does not fall. Then, make the crane arm, which will extend horizontally from the top of the tower. Attach another stick or straw across the top using glue or tape. Make sure the arm can move slightly, as this will help when lifting objects.
5. Add the Pulley System
   A pulley helps the crane lift objects with less effort. To make one, thread a piece of string through a small round object such as a bottle cap or button with holes. Tie one end of the string to the top of the crane arm and let the other end hang down. You can attach a small hook or paper clip to the end of the string for holding weights. The pulley allows the string to move freely as you lift or lower objects.
6. Test Your Crane
   Once your crane is built, test it by attaching a small object, such as a coin or eraser, to the hook. Gently pull the string to lift the object off the ground. If the crane falls or bends, reinforce the base or tower with more tape or cardboard. Keep testing until your crane can lift small objects smoothly. This testing process helps you learn how to improve balance and strength in your design.

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