simple+machines

=__media type="custom" key="4823029"Here is a video of a simple machine that i made at school  What i know.__ = =There are many machines in the world like bulldozers cranes and catapult. = =Bulldozers are used to dig up the ground and make holes in the ground. = =cranes are used to pick up giant boxes and put them on boats to ship off and building towers = =And catapults are used to pick stuff then throw them away and smash things like wood and old chairs.... = =__WHEEL AND AXLE HISTORY__ The earliest waterwheel-the greek mill of the first century BC-had a horizontal wheel.It was superseded by vertical wheels which could be built to a larger size and thus developed greater power. Waterwheels obey the principle of the wheel and axle with the force of the water on the paddles at the rim producing a strong driving force at the central shaft. These are some wheel and axles that i know. Gym weights roller coaster toy vechiles....  __PULLEY__ A pulley is a machine that people use to pull flags up and curtains in a play it is useful because it helps humans pull the bucket out of the well. A pulley can lift boxes to help get the present. Pulleys are useful in plays like the curtains get pulled by a pulley. Pulleys are useful on pirate ships to pull the giant flag up and down. These are some pulleys i know. Drapery pull a lift fixed pulley winch.... INCLINED PLANE A inclined plane can be a plank and a ramp but it can be a catapult. A catapult is a machine that people use to throw wood and old chairs up in the air then it smashes. A inclined plane is very useful in skateboarding because it makes the skateboard go in the air. These are some inclined planes i know. Ramps planks stairs and a water slide.... __LEVER__ A leaver is a machine it can be a crowbar a seesaw and a spoon. A spoon is a object that you can eat breakfast with and ice cream. And a crowbar is used for opening things that have been locked tightly robbers yous crowbars to brake the safe open in a bank to rob the money. And a seesaw is a machine that kids go up and down on it. These are some levers i know. Crowbar a spoon a seesaw and a car brake lever.... __Wedge__ A wedge is a machine like a axe an axe is helpful for chopping down trees because an axe is good for chopping wood. Scissors are used to cut paper in to pieces its very useful. A nail is very useful for putting stuff together like houses and pictures. A knife is used for chopping up food and cutting stuff. These are some wedges i know. Axe knife scissors and a nail.... __SCREW__ A screw is a machine that people use to put stuff in the wall like posters. Manuel drill is a machine that people use to put screws in to the wall by just pressing a button. Nuts and bolts are giant tiny screws that people use to screw into tiny holes. These are some screws i know. Nuts and bolts manuel drill. =