Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 190 · 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.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
2. 2.True or false: skating on ice gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a rough doormat
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) sand on a slippery path (d) powder on a carrom board
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
10. 10.True or false: a grippy rubber sole gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
14. 14.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) powder on a carrom board (d) chalk on a gym bar
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
22. 22.True or false: a smooth steel slide gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
27. 27.True or false: skating on ice gives less friction. (a) False (b) True
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
33. 33.True or false: a wet tiled floor gives more friction. (a) True (b) False
34. 34.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
35. 35.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
36. 36.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
38. 38.🛞 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 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
39. 39.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
40. 40.True or false: sand on a slippery path gives more friction. (a) False (b) True

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