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Simple machines

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Simple machines
Simple machines
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Simple machines

  1. 1. • We use machines all the time • They are every where – at home, at work, on the roads, in the sea and air. • For example ; a cycle, a car and an aeroplane are all machines. cycle aeroplane car
  2. 2. • We use many machines at home e.g. a sewing machine, a washing machine and a clock. • All Machines need energy to work. • Machines make our work easier. sewing machine Washing machine
  3. 3. • We all use simple machines at home. • We use scissors for cutting the paper. • We use a spoon to lift the lid of a can.
  4. 4. • We use a knife to cut fruits. • Scissors, spoon and knife are all machines. Scissors Spoon acting as lever Knife
  5. 5. • A spoon is a kind of simple machine called lever. • A lever has an arm that can move about on a point called fulcrum.
  6. 6. •A see-saw, a wheel barrow and a pair of scissors are all levers. See-saw Wheel barrow scissors
  7. 7. • A wedge is made by putting two inclined planes together. • It increases the force that we apply and also changes the direction of force. • An axe and a knife are the example of wedges. KNIFE AXE
  8. 8. • The slope of the plank is a kind of simple machine called the Inclined plane. • It helps in lifting heavy loads by applying less force. SLOPE OF PLANK LADDER
  9. 9. • A screw is a simple machine that is used to hold two things together. • It has a ridge called a thread which is cut around like a spiral. SCREW
  10. 10. • Most machines are made of wheels. • A wheel turns on a rod called an axle. • A car and train move on wheels, a sewing machine has wheels and a clock has different sizes of wheels. Wheel and axle clock
  11. 11. • A pulley is a simple machine made up of wheels. • The wheel of a pulley turns on an axle. • The pulley is used for lifting heavy loads.
  12. 12. i) Can you tell the name of all the simple machines discussed in the unit? ii) Give any two examples of Lever? iii) Name some machines used at home? iv) A pulley is used for lifting ___________. v) Name the machine used for cutting?

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