Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 134 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a grippy rubber sole (d) chalk on a gym bar
6. 6.True or false: chalk on a gym bar gives less friction. (a) True (b) False
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
10. 10.True or false: a smooth steel slide gives more friction. (a) False (b) True
11. 11.True or false: a tyre with deep treads gives more friction. (a) False (b) True
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
13. 13.True or false: a tyre with deep treads gives less friction. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
18. 18.True or false: a wet tiled floor gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
30. 30.True or false: skating on ice gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
40. 40.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction

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