Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 823 · 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.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a wet tiled floor (d) powder on a carrom board
2. 2.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a box pushed on carpet (d) a tyre with deep treads
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
6. 6.🛞 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 carpet 4 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
7. 7.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
8. 8.True or false: a wet tiled floor gives less friction. (a) True (b) False
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
10. 10.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
15. 15.🛞 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 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) powder on a carrom board (d) a grippy rubber sole
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
21. 21.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
22. 22.True or false: skating on ice gives more friction. (a) True (b) False
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
30. 30.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
31. 31.True or false: a wet tiled floor gives more friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) skating on ice
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.True or false: a rough doormat gives more friction. (a) True (b) False
36. 36.True or false: powder on a carrom board gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) a wet tiled floor

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