7/30/2019 Crazy Facts

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The higher something is, the greater its gravitational potential energy. Back ithe Middle Ages, weapons called trebuchets were used to take advantage of thisprinciple, using mechanical advantage and the gravitational potential energy ofa counterweight to hurl rocks and other projectiles at or over walls. In moderntimes we use the gravitational potential of water to create hydroelectricity. Metals are usually solid, good conductors of electricity and heat, shiny when cean, strong and malleable (meaning they can be bent and shaped). Gold is shiny and doesnt corrode, this means it is a great metal for making jery. More gold facts. The chemical symbol used for silver is Ag, this comes from the Latin word for slver, argentum. More silver facts. While aluminum is the most common metal found in the Earth s crust, the most comon metal found on Earth is iron, mostly because it makes up such a large part of the Earth s core. More iron facts. Copper is a good conductor of electricity and is often used for making wires At room temperature, mercury is the only metal that is in liquid form. Aluminum is a good conductor of heat and is often used to make cooking pots. Alkali metals such as sodium, potassium, rubidium, caesium and francium are extemely reactive elements, just putting them in water can result in an explosion!They are carefully stored in oil to prevent this happening. More alkali metals facts & properties. Tungsten has a very high melting point, after carbon it has the second highest elting point of all elements. Metals are strong and are useful for making tools, buildings, bridges and other

structures where strength is important. Steel is an important alloy (combination of metals) that is created from a mixtre of metals, mostly iron. There are many different types of steel including stainless steel, galvanized steel and carbon steel. Steel is commonly used to makea number of products including knives, machines, train rails, cars, motors and wires. Bronze is a metal alloy made from copper and tin. Copper makes up the larger amunt, usually between 80 to 95%. The noise that is thunder is created when the air around lightning gets rapidlyheated and expands at a rate faster than the speed of sound. Rather than putting on weight from eating celery you actually lose it, you burnmore calories from the chewing than you put on from the food itself. Sound travels 4 times faster in water than it does through air.

Cranberries can be tested for ripeness by bouncing them, if they are ripe they hould have a bouncing quality. Travelling at 80 kilometres per hour, a car uses half its fuel to overcome windresistance. The largest living structure on Earth is the Great Barrier Reef. Found in Austrlia, it is over 2000 kilometres long. The QWERTY keyboard layout used on most computers was invented way back in the 860 s. Some types of bamboo can grow nearly a metre a day! Diamonds are the hardest known substance. Light from the sun can reach a depth of 80 metres in the ocean. When you crack a whip, it makes a loud noise because the tip is actually movingfaster then the speed of sound!