Finding Nemo Simple Machines

Finding Nemo Simple Machines
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  • Hey dad, whats that down there?
  • It's a sunken ship!
  • I found this cool thingy! What is it?
  • That, son, is a pulley.  The pulley changes the direction of the force. A groved wheel turns around an axle. Then, a rope or chain is used to lift the heavier objects.
  • So the longer the ramp of the same height, the easier the object is to move?
  • What about that thing that leads onto the boat?
  • That's a ramp. They use those to move an object easier. They trade effort for a greater distance.
  • Exactly!
  • Those things are called seasaws right?
  • That's right! A seasaw is a type of lever. This boat must have been shipping them. Levers are a rigid bar that turns on a fulcrum. The longer the side with the load, the easier the object is to lift
  • How can you tell what will be more effective?
  • Levers involve something called mechanical advantage, just as all simple machines. Mechanical advantage is the ratio of output force to input force. We can tell a lever works by using the length of the arm on either side of the fulcrum. We use this to find Mechanical Advantage, telling us h ow effective something is.
  • Wow! That sounds like it makes work easier. 
  • Huh?
  • Work means something different in science. Work is the transfer of energy that comes from force applied over a distance.
  • Do you mean scientific work?
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