Hong Kong is famous for its development throughout the city. However it is a really small city where buildings and houses have to be built taller and smaller, in a size where 7.155 million people have to fit. Therefore the construction process requires a specialized machine. The tower crane is the machine that has saved many homeless people. This machine is used all over the world. It helps to build anything that is tall or heavy, the height reaches thirty meters and could reach far. Not only is it the life-saving machine for building apartments, lifting steel and concrete, but it is also a machine that has physics behind it. The tower crane is built rather difficult. It has many features that make it so unique. First of all, “counterweight” is the main function that relates to physics in terms of leverage. It weighs approximately 20 tons. The diagram above shows that there is a feature called “jib” which refers to the crane arm. Both are separated by the “tree. These three functions are like a lever. If you look at it from a different approach, the counterweight is the load of the lever, the jib is the force of the lever, and the shaft is the pivot point of the lever. When a force is applied to the arm it would go downwards, however the counterweight balances it using the law of levers. The tower crane can stretch up to 230 feet in the air, or 70 meters. It can carry anything weighing less than 39,690 pounds. But if the load is applied right on the edge of the boom, the tower crane will not be able to balance the load. It may eventually break or fall apart. There are two anti-lint switches that ensure that the operator does not tip the tower crane. There are four huge anchor bolts holding the base of the tower crane. Attached dee...... in the middle of the document ...... it is necessary to use a tower crane for men in the construction sector because if they do not follow the safety regulations exactly when climbing the stairs towards the operations center, you could probably fall from the tower crane. Ultimately, for the people on hand, if unfortunately a storm comes to the site and the people were not prepared by this situation or were not informed, the tower crane may lose its balance. It could fall if the anchor was not stable enough to withstand the storm. Overall I think the tower crane is beneficial. Especially because it helped Hong Kong solve the problem of land shrinkage and at the same time provide citizens with more homes. However, another problem is that they complain that the provided houses are too expensive and the area provided for an individual house is too small. Despite this it is a very intelligent invention based on the law of levers.