Technology 1-2 ESO – Unit 9 MECHANISMS extra activities
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1 – Explain which type of pulley would you use to move: a) A 0.8 kg load. b) A 5 kg load. c) A 50 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
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8 – Fill the crossword with words about mechanisms.
