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Initial javelins were made of wood until the mid-1950's. Dick Held improved javelin aerodynamics and durability by introducing aluminum javelins around that time (his brother, Bud, was the world-record holder for a time). Current javelins are made of steel, aluminum and/or carbon fiber.
wood and iron
wood and iron
iron
none, automobiles are the innovations not the innovator.
It is made from carbon fibre because it is lighter so it will stay in the air for longer
automobiles
there was 134,000 automobiles made is 1950
traction.
due to friction
Mobile sound systems are not only made for automobiles. Mobile sound systems are made for a variety of others such as motorcycles and bicycles and for outdoor events,.
Science has been used to create airbags, and seatbelts to make automobiles safer. =)