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FORCES AND MAGNETISM - Coggle Diagram

- - - - In space, a natural body which orbits
        a larger planet is called a natural satellite
      - Moon is a natural satellite of the Earth.
    - - Artificial Satellites were made
        and designed by scientists
      - What artificial satellites do you know?
        
        Some of satellites provide TV signals (tin hiệu)
        and GPS used on ships, aeroplanes and some car.
        
        The International Space Station
        is an artificial satellite that has scientists
        living on it for years at a time.
        
        Some of the satellites continuously ( liên tục )
        take photographs which help to make
        weather predictions ( dự bán thời tiết).
      - How does an artificial satellite get in to the space?
        
        At a certain distance above the Earth it needs to reduce the speed at 27 200km/h it will go into orbit.
        
        If its speed drops below 27 200km/h
        it will fall back to the Earth.
        
        An artificial is launched into space by powerful rockets to travel over 37 600km/h to overcome the force of gravity pulling it towards the centre of the Earth.
- - - - Steel is an alloy made mainly from iron.It is much stronger than iron. We use steel to make machines, steel pipes and bridges.
      - Chromium is mixed with steel to make an alloy called stainless steel.Stainless steel does not rust. It is used in many objects such as knives, sinks and medical instruments.
      - Brass is an alloy of copper and zinc. We use brass to make door handles and ornaments.