S.I.F. Study is fun

What is the Point of a Pulley? In its simplest implementation, a pulley simply turns a force in one direction into a force in another direction. This might be useful if it’s easier to apply a force in one direction than the other (e.g. to pull downwards rather than push upwards). A pulley really comes into its own when it is combined with another pulley to create a system known as a  block and tackle , allegedly invented by Archimedes in the third century BC. The simplest block and tackle, the  gun tackle , uses two pulleys, which are usually mounted above one another (for clarity, they are shown separated in the diagram below). The load (W) is shared between the tension in the rope and the mount that attaches the block and tackle to the ceiling, and thus you only have to pull with a force equal to half the weight in order to lift it. However, you will have to pull the rope twice as far and thus the conservation of energy is not violated (lifting a one hundred newton weig

Introduction of Magnetism and Matter Index ü   History ü   Definition of Magnets and Magnetism in physics ü   Source of Magnetism or Cause of Magnetism ü   Classes of Magnetic Materials ü   Definition of Matter ü   Different States of Matter ü   Relation between Matter and Magnetism ü   Conclusion ü   Frequently asked Questions (FAQs) History In the ancient world when people started noticing that Lodestones (magnetized pieces of mineral magnetite) was able to attract iron it was then only when the concept of magnetism was introduced. Indian surgeon  Surushastra  was the first person to use magnets for surgical purposes.   Definition of Magnets and Magnetism in physics Magnets:  The ability of an object or a material to produce invisible magnetic field lines in order to develop a force which attracts other ferromagnetic materials such as iron, steel, etc. are known as  Magnets . Magnetism:  Magnetism is a pheno

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