(Q-2) Invention of the wheel ?
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Answers
Answer:
When Was the Wheel Invented?
Though often thought of as one of the earliest inventions, the wheel actually arrived after the invention of agriculture, boats, woven cloth, and pottery. It was invented sometime around 3,500 BCE. During the transition between the Neolithic and the Bronze Age, the very earliest wheels were made of wood, with a hole in the core for the axle. The wheel is unique because, unlike other early human inventions such as the pitchfork—which was inspired by forked sticks—it is not based on anything in nature.
The Inventor of the Wheel
The wheel is not like the telephone or the lightbulb, a breakthrough invention that can be credited to a single (or even several) inventors. There is archaeological evidence of wheels dating back to at least 5,500 years ago, but no one knows exactly who invented them. Wheeled vehicles appeared later in various areas across the Middle East and Eastern Europe. The invention of the wheelbarrow—a one-wheeled cart used to transport goods and raw materials—is usually credited to the ancient Greeks. However, earlier evidence of wheeled carts has been found in Europe and China.
Wheel and Axle
Bronocice pot
The Bronocice pot is the earliest depiction of a wheel and axle.
Silar / Wikimedia Commons
The wheel alone, without any further innovation, would not have done much for mankind. Rather, it was the combination of the wheel and axle that made early forms of transportation possible, including carts and chariots. The Bronocice pot, a piece of pottery discovered in Poland and dating to at least 3370 BCE, is believed to feature the earliest depiction of a wheeled vehicle. The evidence suggests that small wagons or carts, likely drawn by cattle, were in use in Central Europe by this time in human history.
The first carts featured wheels and axles that turned together. Wooden pegs were used to fix the sledge so that when it rested on the rollers it did not move. The axle turned in between the pegs, allowing the axle and wheels to create all the movement. Later, the pegs were replaced with holes carved into the cart frame, and the axle was placed through the holes. This made it necessary for the larger wheels and thinner axle to be separate pieces. The wheels were attached to both sides of the axle.
Finally, the fixed axle was invented, wherein the axle did not turn but was solidly connected to the cart frame. The wheels were fitted onto the axle in a way that allowed them to freely rotate. Fixed axles made for stable carts that could turn corners better. By this time the wheel can be considered a complete invention.
Following the invention of the wheel, the Sumerians invented the sledge, a device consisting of a flat base mounted on a pair of runners with curved ends. The sledge was useful for transporting cargo over smooth terrain; however, the Sumerians quickly realized that the device would be more efficient once it was mounted on rollers.
Explanation:
Answer:
wheel
Explanation:
n its primitive form, a wheel is a circular block of a hard and durable material at whose center has been bored a hole through which is placed an axle bearing about which the wheel rotates when torque is applied to the wheel about its axis. The wheel and axle assembly can be considered one of the six simple machines. When placed vertically under a load-bearing platform or case, the wheel turning on the horizontal axle makes it possible to transport heavy loads. This arrangement is the main topic of this article, but there are many other applications of a wheel addressed in the corresponding articles: when placed horizontally, the wheel turning on its vertical axle provides the spinning motion used to shape materials (e.g. a potter's wheel); when mounted on a column connected to a rudder or to the steering mechanism of a wheeled vehicle, it can be used to control the direction of a vessel or vehicle (e.g. a ship's wheel or steering wheel); when connected to a crank or engine, a wheel can store, release, or transmit energy (e.g. the flywheel). A wheel and axle with force applied to create torque at one radius can translate this to a different force at a different radius, also with a different linear velocity.