Ramps
Egyptians
built pyramids around the year 2500 BC. Moreover, for around 3,800 years the
tallest structure in the world was the Great Pyramid of Giza. It was built by
cutting the big stones on the ground, then used ramps to push them up.
However, the Great Pyramid took around twenty years to be built. Nowadays, we
use cranes to lift building materials. Therefore, we are able to build
skyscrapers in less than one year.
Levers
In around
260 BC, lever was described by an ancient Greek mathematician called
Archimedes. Levers are used to lift heavy objects. It is known that builders in
ancient Egypt used levers to move and stand up stone pillars. Those days, many
of the tools we use are levers, like hammers and scissors.
Screws
In the first
century, Greece was the first country to use screw. It was used to move heavy
objects by rotating them around in a circle. Today we use screws to fix things
in place. Example: light bulb.
Wheels and
axles
In around
3200 BC, wheels were used for transportation in Iraq. It was a solid disk on an
axle. It was used to move chariots. Nowadays, wheels are used in all the modern
transportation like cars, bicycles, trains and airplanes.
Gypsi
Database. (2014). Retrieved from http://filippom.iics-k12.com/lever/
All-tech.
(2012). Retrieved from http://www.all-techspecfast.com/fastener.html
Spadafora, R. R.
(2011, June 25). Retrieved from
http://www.education.com/reference/article/firefighter-exam-study-guide-wheel-pulley/
Pritchard, E.
(2014). Oxford discover. Oxford: Oxford University Press.
