Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 120 · 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 carpet 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.True or false: skating on ice gives less friction. (a) True (b) False
6. 6.True or false: sand on a slippery path gives less friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) oil on a squeaky hinge
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a smooth steel slide (d) skating on ice
11. 11.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
13. 13.True or false: a tyre with deep treads gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
17. 17.True or false: a box pushed on carpet gives more friction. (a) True (b) False
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
20. 20.🛞 More or less friction: a grippy rubber sole? (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.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
25. 25.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a smooth steel slide (d) a rough doormat
26. 26.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
27. 27.🛞 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 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
32. 32.🛞 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 wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
33. 33.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
38. 38.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
39. 39.True or false: powder on a carrom board gives less friction. (a) False (b) True
40. 40.True or false: a rough doormat gives more friction. (a) True (b) False

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