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SIMPLE MACHINE

SIMPLE MACHINE. INTRODUCTION. Any devices helping to make work easier for us is called a machine. COMPLEX AND SIMPLE MACHINE. There are two machines, they are a complex machine and simple machine. LEVER (PENGUNGKIT).

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SIMPLE MACHINE

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  1. SIMPLE MACHINE

  2. INTRODUCTION • Any devices helping to make work easier for us is called a machine.

  3. COMPLEX AND SIMPLE MACHINE • There are two machines, they are a complex machine and simple machine.

  4. LEVER (PENGUNGKIT) • A lever is a simple machine made with a bar free to move about a fixed point. The lever consists of parts, load, load arm, fulcrum, effort arm, and effort.

  5. Lever First Class • Example • Scissors • Pliers • See-saw

  6. Second Class • Example • Wheelbarrow • Bottle can opener • Paper cutter • Nutcracker

  7. Third Class • Example • Human arm • Golf club • Fishing rod Fulcrum

  8. The relationship between the effort and load and their respective distance from the fulcrum Load x Load Arm = Effort x Effort arm Mechanical advantage = load/effort MA = L/E

  9. example 1. Find the effort needed to lift load ?

  10. PULLEY (KATROL) • The device to assist in lifting an objcts

  11. Three types of pulleys • A Fixed Pulley Is a pulley that is attached to stationary structure. • A Movable Pulley Is pulley that is not attached to a stationary structure • A Pulley System In a combination of fixed and movable pulley

  12. Katroltunggalbebas, KM = 2 • Katrol tunggal tetap, • KM = 1

  13. Katrolgandadengan tarikankeatas, KM = 3 (jumlahtali) • Katrol ganda dengan tarikan ke bawah KM = 2, • dihitung dari jumlah tali dikurang 1

  14. INCLINED PLANES (BIDANG MIRING) • An inclined plane is a simple instrument consist of a sloped flat surface such as wedges, screws, and bolts.

  15. The MA of an inclined plan is equal to the length of the slope (s) divided by the height (h) of the inclined plane

  16. WHEEL (RODA) • Bicycle rider can set the ratio of the chain wheel (front gear) and freewheel (back gear) to adjust to the road being travelled

  17. The smaller the back gear, the heavier the pedalling, but the large the rate of acceleration • The larger the back gear, the lighter the pedalling, but the slower the bicycle will move

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