Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 386 · 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 glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
2. 2.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 15 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
9. 9.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
12. 12.True or false: sand on a slippery path gives more friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a box pushed on carpet (d) powder on a carrom board
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.🛞 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 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a tyre with deep treads (d) a box pushed on carpet
17. 17.True or false: sand on a slippery path gives less friction. (a) False (b) True
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
20. 20.True or false: a box pushed on carpet gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wet tiled floor (d) a tyre with deep treads
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
23. 23.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.🛞 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 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, a carpet 14 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a wheel on ball bearings (d) skating on ice
38. 38.True or false: a rough doormat gives more friction. (a) False (b) True
39. 39.True or false: a grippy rubber sole gives less friction. (a) True (b) False
40. 40.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction

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