Engineering Worksheet: Friction

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

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