Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 394 · 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.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
2. 2.True or false: skating on ice gives less friction. (a) True (b) False
3. 3.True or false: a tyre with deep treads gives more friction. (a) False (b) True
4. 4.True or false: a grippy rubber sole gives more friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a grippy rubber sole (d) a box pushed on carpet
6. 6.True or false: a smooth steel slide gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
11. 11.🛞 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 9 N, a carpet 13 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) a smooth steel slide
13. 13.True or false: a grippy rubber sole gives less friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 13 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.True or false: sand on a slippery path gives more friction. (a) False (b) True
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
21. 21.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
22. 22.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
23. 23.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
26. 26.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) sand on a slippery path (d) a wet tiled floor
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
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 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a wet tiled floor (d) a box pushed on carpet
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
34. 34.🛞 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 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
40. 40.🛞 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, a carpet 14 N, ice 3 N. How many newtons more were needed on a carpet than on ice?

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