Also, to use a sledgehammer as a steel driver you have to swing your arms and slam down on these huge spikes/nails that needed to be put in to keep the railroad in place. So, he would not be able to do this, because he would have twenty pounds in each of his hands and it would be a struggle to swing 20 pounds in a circular
Wheels facilitated, rollershoes make it possible for the wearers to slide at nearly any smooth concrete ground. Nevertheless, wheels are capable of shifting directions easily, which in turn adds the difficulty of people’s controlling over it.
It consists of two simple machines: a lever , wheel and axle.Force is applied to the lever by leveling up the handles of the wheelbarrow. The lever, produce upward force to the load (Figure 17).The force exerted is increased by the lever, this caused the load can be lift easily.Reaction force is applied on the wheel of the wheelbarrow by pushing it over the ground. The rolling wheel helps the wheelbarrow lift the load in site easily. It’s undeniable to say that wheelbarrow is a useful transport equipment over short distances. Wheelbarrow functions as transfer construction materials such as soil, gravel, sand, aggregate, stone, and concrete from one place to another places (Figure 18) .Wheelbarrows are made in many different types and qualities.
This system consists of wooden platform upon which a belt and pulley mechanism is mounted. Flat belt is connected with two pulleys. Wooden pulley is used for drive the flat belt. One pulley is attached to the motor shaft and another pulley is attached to the bearing shaft. Nozzle having inlet diameter ¾ inches and outlet diameter ¼ inches which is made of plastic are used and mounted on the belt.
With this special type of belt it also uses a electronic circuit for continuously changing the distance between the pulleys depending on the engine output which is analogous to the shifting of gears. The advancement in push belt type has been rapid in few years and it has drawn more attention of automakers. Fig. 2.Model of Push Belt CVT  Fig. 3.Composition of Push Belt 2.2.
It allowed the vehicle to move faster and more able maneuver. Around 2000BC, the use of copper nails sticking out of a wheel provided better traction. In700BC, iron rims were put at the edge of wheels which give the wheel more strength and durability. Another way to increase the speed and weight is to used multiple animals, this is idea begun in 100BC. When wheels were used at carts and wagons, it was the first idea to build roads that can be used repeatedly.