This is final of "How Protect Our teeths"
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This is final video How Protect Our teeths. i hope this fun clip kids'll like and save their teeths.
Brush Your teeth!
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Brush your teeth carefully! Hey freinds this is song and helpful video to kids and childrens to protect their teeths from damages.
We Should Brush Our teeth
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This is topic about "We Should Brush our teeth" We must brush our teeth two times. First one is morning and second time is before every night we go to bed.
How Brush your teeth?
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Hello kids kutties, this is for you... how brush your theeth carefully, and protect your teeth from jems and other bacterias, I hope this willl helpful to you.
Spring Catapult
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The greeks continued to improve their catapult designs. In addition to simply flexing and bending a rod in order to produce force, they added more energy.
They also began to use springs made of large ropes of animal hair. The soldiers pulled back on the handle, and the "hair spring" became twisted, strong up energy. when the spring was released, the catapult shot rocks, arrows, or burning tar onto enemies.
Levers: The Product of Ancient Greek Warfare
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In many cases, we can't identify the inventors of ancient machines. Just as we don't know who invented the winch, we don't know the name of the Greeck soldier who invented catapult.
And yet his invention brought his people many victories in ancient battles.
The Greeks were among the first people to use catapults in warfare. They clearly inted that catapults wouldbe used to hurl an object over a long distance with great force.
Catapults are powerful and clever devices, but they're nothing more that simple leavers. To see how a catapult works, think of a screwdriver.
Have you ever used one to pry open a can of paint? The metal lid is wedged in tight, but if you use a screwdriver as a lever to pry the lid off, the can is easy to open.
And yet his invention brought his people many victories in ancient battles.
The Greeks were among the first people to use catapults in warfare. They clearly inted that catapults wouldbe used to hurl an object over a long distance with great force.
Catapults are powerful and clever devices, but they're nothing more that simple leavers. To see how a catapult works, think of a screwdriver.
Have you ever used one to pry open a can of paint? The metal lid is wedged in tight, but if you use a screwdriver as a lever to pry the lid off, the can is easy to open.
Winches in Ancient China
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One of the most basic human needs is that for water. people living in ancient times spent a great deal of time thinking about how to gater and store water.
The need for a daily supply of water limited the number of places in which people clould live. Many groups settled near streams, rivers, and lakes.
If people wanted to live somewhere that was not close to a body of water, they had to find another way to meet their daily water needs.
Eventually, it was discovered that rivers and lakes exist underground. People began digging deep wells in order to use the groun water supply. However , pulling the water out of the wells required the development of another simple machine.
Ramps in Ancient Egypt
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Have you ever watched people unload their belongings from a moving van? The ramp propped onto the back of a moving van is a simple machine. A ramp is an inclined plane that works by reducing the amount of force needed to move an object.
scientists believe the ancient Egyptains were well aware of the concept of the ramp and used it to make their work easier while building the pyramids.
suppose that you are the manager of a construction team in ancient Egypt. Your team has to lift a boulder weighing 5000LB 50 ft into the air. How will you do it?
If the team tried to lift boulder straight up, they would have to apply 250,000 lb of force to it. Impossible! But suddenly, you have the idea of building a 200-ft slope leading up to the construction site, and the idea.
scientists believe the ancient Egyptains were well aware of the concept of the ramp and used it to make their work easier while building the pyramids.
suppose that you are the manager of a construction team in ancient Egypt. Your team has to lift a boulder weighing 5000LB 50 ft into the air. How will you do it?
If the team tried to lift boulder straight up, they would have to apply 250,000 lb of force to it. Impossible! But suddenly, you have the idea of building a 200-ft slope leading up to the construction site, and the idea.
Machines Of the Ancient World
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Introduction
These days, we use many impressive technical gadgets in our everyday lives. Just think of all of these electrical devices you use; televisions, stereos, compuiters, cellulae phones- the list goes on.
You might think that the word technology applies only to electronics. However, technology, as it is discussed in science, refers to more than just Your DVD Player.
Technology includes any tools that we use to make life easier. In fact, long before the invention of the computer, humans were clever inventors. Many of the tools we use today are based on devices that ere invented thousands of years ago.
These days, we use many impressive technical gadgets in our everyday lives. Just think of all of these electrical devices you use; televisions, stereos, compuiters, cellulae phones- the list goes on.
You might think that the word technology applies only to electronics. However, technology, as it is discussed in science, refers to more than just Your DVD Player.
Ear Anatomy pt-4
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This is best ear anatomy all of these video tutorials. I hope you'll like it if you want more informations. Visit here "www.myscienz.blogspot.com"
Ear anatomy pt-3 the Corti
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The Corti is a organ it has in middle ear. It contains auditory inner and outside hair cells. It's blog other unkown particles dusts. Save the ear.
Ear anatomy - pt2
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This is the Ear Anatomy pt-2 inside the ear, how indisde the organs functions you're able to watch that here and tell about this.
Ear Anatomy pt-1
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Hello freinds! THis is about Ear anatmoy. Our organ ear is very import to us for listen voice, noise or other sounds from vibrattions.
Was Worng about Falling Objects?
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Have you ever dropped a penny and a quarter at the same time from the same height? Try it, and you will see that the two coins hit the ground at the same time. This results doesnot agree with aristotle's ideas. according to aristotle, the heavier coin should strike the ground first.
Problems with Aristotle's Ideas
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Aristitle's ideas were accepted as the truth for hundreds of years. At a quick glance, his ideas seem to be common sense. For example, a rock dropped from an outstretched hand does fall in a straight line.
it seems logical that a heavy stone should fall faster than a much lighter block of wood. However, there are problems with aristotle's ideas.
Think about an archer who shoots a flaming arrow into the night sky.
The Curving path of the arrow's flight is shown in the illustration below. This curved path does not agree with Aristotle's belief that all motion on earth must be in a straight line.
it seems logical that a heavy stone should fall faster than a much lighter block of wood. However, there are problems with aristotle's ideas.
Think about an archer who shoots a flaming arrow into the night sky.
The Curving path of the arrow's flight is shown in the illustration below. This curved path does not agree with Aristotle's belief that all motion on earth must be in a straight line.
Ideas about Weight and Falling Speed
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Aristotle's interest in the structure of living things was encouraged by his father. That intrest helped Aristotle develop strong observation skills. He went on to apply his observation skills to a wide range of topics.
Those topics included politics,nature,ethics,astronomy,and physics.
In time, Many of Aristotle's teachings in physics would be proved wrong. His errors included thinging that
- All motion on Earth occurs in a strainght line(called linear motion)
- an object continues in motion only as long as someting acts on it to keep it moving.
- a heavy object falls faster than a light object.
- Earth is at the center of the Universe.
Thinking About Motion
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Aristotle And Motion
Thin about dropping a rock while you are walking. What do you expert to happen? You expect the rock to fall and hit the ground.
But why does this happen? Is some strange force at work?
What path does the rock follow on its way to the ground? does it fall straight down? In ancient times, people known as philosophers through about questions like these.
In the says of the ancient philosophers, there were no microscopes or telescopes. No one could make exact measurements. People didn't do controlled scientific experiments. In those days, Philosophers depended on the power of the mind to find truth. The greek philosopher Aristotle was one of the most important of these early thinkers.
Aristotle was the son of a medical doctor. He was born in 384 B.C in northern Greece. He went to school at Plato's Academy. Then he became a teacher there.
Thin about dropping a rock while you are walking. What do you expert to happen? You expect the rock to fall and hit the ground.
But why does this happen? Is some strange force at work?
What path does the rock follow on its way to the ground? does it fall straight down? In ancient times, people known as philosophers through about questions like these.
In the says of the ancient philosophers, there were no microscopes or telescopes. No one could make exact measurements. People didn't do controlled scientific experiments. In those days, Philosophers depended on the power of the mind to find truth. The greek philosopher Aristotle was one of the most important of these early thinkers.
Aristotle was the son of a medical doctor. He was born in 384 B.C in northern Greece. He went to school at Plato's Academy. Then he became a teacher there.
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