Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 355 · 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: a wooden plank 5 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.True or false: powder on a carrom board gives more friction. (a) False (b) True
5. 5.True or false: a rough doormat gives less friction. (a) True (b) False
6. 6.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
7. 7.True or false: skating on ice gives more friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) skating on ice (d) a wet tiled floor
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
12. 12.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
13. 13.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) sand on a slippery path
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
19. 19.True or false: sand on a slippery path gives more friction. (a) True (b) False
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
24. 24.True or false: chalk on a gym bar gives more friction. (a) False (b) True
25. 25.True or false: chalk on a gym bar gives less friction. (a) False (b) True
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wet tiled floor (d) a box pushed on carpet
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.True or false: a box pushed on carpet gives less friction. (a) True (b) False
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wet tiled floor (d) powder on a carrom board
39. 39.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
40. 40.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction

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