Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 814 · 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: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
3. 3.True or false: sand on a slippery path gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a grippy rubber sole (d) a box pushed on carpet
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) powder on a carrom board (d) oil on a squeaky hinge
6. 6.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.True or false: a tyre with deep treads gives more friction. (a) True (b) False
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
10. 10.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) sand on a slippery path
12. 12.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) skating on ice (d) chalk on a gym bar
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
14. 14.True or false: a wet tiled floor gives less friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
17. 17.🛞 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 11 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
20. 20.🛞 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 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.True or false: chalk on a gym bar gives less friction. (a) True (b) False
23. 23.True or false: a rough doormat gives less friction. (a) True (b) False
24. 24.🛞 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) ice (b) a carpet (c) sandpaper (d) a glass sheet
25. 25.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
26. 26.True or false: a tyre with deep treads gives less friction. (a) False (b) True
27. 27.True or false: a smooth steel slide gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a wet tiled floor (d) a grippy rubber sole
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.True or false: a rough doormat gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
34. 34.🛞 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 8 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) skating on ice
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
40. 40.True or false: sand on a slippery path gives more friction. (a) True (b) False

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