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Simple machines for grade 4

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Simple machines for grade 4

  1. 1. Lever  It is a long rod that can be used to cut things, move heavy objects, or open tins.  for example :hammer, bottle-opener, a pair of Scissors etc.
  2. 2.  A pulley is made up of a grooved wheel and a rope. It is used to lift loads. Machines such as cranes and sailboats make use of pulleys.
  3. 3. Wheel and Axle Wheel and axle is made up of a wheel through which a rod is called axle passes. Such a combination helps to move objects or change their direction.  Machines such as cars, roller skates and door knobs make use of wheel and axle.
  4. 4. Inclined Plane Inclined plane is used to lift heavy loads to a height easily. An inclined plane makes movement easier. Some examples are ramp , slanted road , path up a hill , slide etc.
  5. 5. WEDGE A wedge is a simple machine used to push two objects apart. A wedge is made up of two inclined planes . These planes meet and form a sharp edge. This edge can spilt things apart. Some examples are knives, axes, forks, nail ,etc.
  6. 6. Screw A screw has ridges and is not smooth like a nail . Screws are also used to hold objects together. They are used in key rings , bottle caps , fountain pen caps, etc.
  7. 7. Whenever you pick up anything heavy, your elbow acts as the fulcrum of the lever, and your arm bone acts as the lever itself.  Natural body levers first developed in fish around 440 million years ago.  people used the lever in some form, for moving heavy stones or as digging sticks for land cultivation.
  8. 8. Questions
  9. 9. Fill in the blanks. ----------------- is a wheel and axle.  A well is a --------------. A ---------------- is made up of a grooved wheel and a rope. Ramp is a example of --------------- Roller skates are example of --------------- Wheel barrow is an example of ------------

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