2. Linking & Guiding Name that System! How Stuff Works Under Pressure That’s So Random! 10 20 30 40 50

3. Question 1 - 10 What acts as the guiding component for the chair in the picture below?

4. Answer 1 – 10 The guiding component is the black frame of the rowing machine, which guides the seat in a translational motion

5. Question 1 - 20 Describe the characteristics of the link between the broomball stick and the plastic bottom:

6. Answer 1 – 20 DIRECTINDIRECT RIGIDELASTIC REMOVABLENON-REMOVABLE COMPLETEPARTIAL

7. Question 1 - 30 What kind of guiding would be used to guide a garage door open?

8. Answer 1 – 30 Translational

9. Question 1 - 40 What type of guiding is pictured below?

10. Answer 1 – 40 Rotational

11. Question 1 - 50 What is the difference between a complete link and a direct link?

12. Answer 1 – 50 A complete link means that the two parts can’t move independently of each other (ie. if you move one part, the linked part moves too). A direct link means that the two objects are attached directly, with nothing in between.

13. Question 2 - 10 What is the name of the system below and is it reversible?

14. Answer 2 – 10 Gear Train (motion transmission system) YES: it is reversible

15. Question 2 - 20 What kind of motion transformation is happening in this system? Is it reversible?

16. Answer 2 – 20 Slider-Crank Mechanism: rotational translational YES: it is reversible

17. Question 2 - 30 What is the name of the system? Is it motion transmission or transformation?

18. Answer 2 – 30 Worm and wheel – motion transmission

19. Question 2 - 40 Name the system below. Which component acts as the driver?

20. Answer 2 – 40 Cam and follower – motion transformation The driver is the cam which rotates.

21. Question 2 - 50 What are the only two motion transformation systems that are reversible?

22. Answer 2 – 50 Rack and Pinion rotational translational Slider-Crank rotational translational

23. Question 3 - 10 Explain how you would tighten this clamp, and how it holds something in place:

24. Answer 3 – 10 When the handle is rotated, the screw is guided in a helical motion which closes and puts pressure on what it’s holding in place.

25. Question 3 - 20 Using the diagram below, explain how a windmill makes energy

26. Answer 3 – 20 The wind pushes the blades, which turns the shaft attached to the red gear. The red gear turns the smaller gear, which is attached to a generator. The generator converts the wind energy to electrical energy

27. Question 3 - 30 What happens to the man when the red crank is turned?

28. Answer 3 – 30 When the red crank is turned, the cam will rotate, causing the follower to move up (translational motion), which then lifts the mans foot up and down.

29. Question 3 - 40 In the diagram below, explain how the wire controls the motion of the brake blocks: Wire -> Metal levers ->

30. Answer 3 – 40 When the wire is pulled up, the metal levers rotate around the screw and cause the brake blocks to close around the wheel rim Wire ->

31. Question 3 - 50 Explain how the drilling table is raised and lowered: table

32. Answer 3 – 50 When the handle turns, the gear (pinion) rotates and moves up or down the rack. This causes the drilling table to move up or down, to match the height of the person using it.

33. Question 4 - 10 What is an example of tension?

34. Answer 4 – 10 Anything that involves the action of stretching out a material – ie. elastic band, tug of war etc.

35. Question 4 - 20 What constraint is the sponge under?

36. Answer 4 – 20 Torsion

37. Question 4 - 30 What constraint is a body builder under when holding a barbell overhead?

38. Answer 4 – 30 Compression

39. Question 4 - 40 Objects with this mechanical property can return to their original shape when they undergo torsion, deflection, compression and tension.

40. Answer 4 – 40 Mechanical property = elasticity (the ability to return to original shape after being subjected to a constraint)

41. Question 4 - 50 Name at least two constraints this building experiences:

42. Answer 4 – 50 1.Deflection 2.Compression

43. Question 5 - 10 Which gear in the diagram below would go the fastest?

44. Answer 5 – 10 The yellow gear because it has the fewest teeth

45. Question 5 - 20 You need to build new hockey sticks for the Bears. What are two properties you would look for when shopping for materials?

46. Answer 5 – 20 Hardness: ability to resist indentation Resilience: ability to resist shocks without breaking Stiffness: ability to retain shapes when subjected to constraints

47. Question 5 - 30 What is the name of the system below? Name two components that are rotating in the same direction.

48. Answer 5 – 30 Belt and pulley (motion transmission)

49. Question 5 - 40 How many times does the big gear turn if the small gear is turned 4 times?

50. Answer 5 – 40 Gear Ratio= 20/80 = 0.25 0.25 x 4 = 1 So if the small gear turns 4 times, the large gear turns 1 time.

51. Question 5 - 50 Would a ceramic or wood floor be better in a bathroom if you wanted the floor to last for a long time?

52. Answer 5 – 50 Ceramic tile would be better because the moisture from the water in the bathroom could break down wooden floors over time.