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Technology 1-2 ESO – Unit 9 MECHANISMS extra activities

1 –  Explain which type of pulley would you use to move:

  • a) A 0.8 kg load.     b)  A 2 kg load.     c)  A 30 kg load.
2 –  Look at the picture of the two children sitting on a see-saw. The see-saw doesn´t move, it doesn´t go up or down.

The small child is 4 m away from the fulcrum (load arm). The bigger child is 2 m away from the fulcrum (effort arm). The small child weights 30 Kg (load).

  • a)  How much does the big child weigh (effort)?
  • b)  What type of lever is the see-saw?

3 –  Calculate the effort to move a load with a lever if:

  • a)  Load arm = 30 cm ; effort arm = 10 cm ; Load = 1 Kg
  • b)  Load arm = 60 mm ; effort arm = 12 mm ; Load = 10 Kg
  • c)  Load arm = 8 cm ; effort arm = 24 cm ; Load = 30 Kg
  • d)  Load arm = 25 m ; effort arm = 5 m ; Load = 100 Kg

4 –  Watch the video on “How It Works The Crank Shaft” and answer:

  • a)  What is moving the crankshaft?
  • b)  Is the crankshaft a straight bar? Why?

5 –  Watch the video on “how a clutch works” and answer:

  • a)  What is the function of the clutch?
  • b)  What are the parts of the clutch?
  • c)  What happens when we rise the clutch pedal?
  • d)  Why do we have to rise the clutch pedal gradually?

6 –  Watch the video on “How Car Brake Works ” and answer:

  • a)  What type of brake do we use in the front wheels?
  • b)  Why do we use vacuum from the engine in the braking system?
  • c)  What does the pressurised fluid do when it reaches inside the calliper?
  • d)  What are the differences between the rotor brakes (also called “disc brakes”) on the front wheels and the drum brakes on the rear wheels?

7 –  Which of these mechanisms have linear motion and which have rotary motion?

  • a) Motor     b)  Belt     c)  Pulley     d)  Spur Gears     e)  Clutch