Engineering Worksheet: Friction

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

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