Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 442 · 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.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
2. 2.True or false: a wet tiled floor gives more friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
5. 5.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
6. 6.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 13 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
8. 8.True or false: sand on a slippery path gives less friction. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
12. 12.True or false: a smooth steel slide gives less friction. (a) True (b) False
13. 13.True or false: a wet tiled floor gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wet tiled floor
16. 16.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
17. 17.🛞 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 carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
25. 25.True or false: chalk on a gym bar gives more friction. (a) True (b) False
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
27. 27.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
28. 28.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
32. 32.True or false: a tyre with deep treads gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
34. 34.🛞 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 10 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 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 7 N, sandpaper 8 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) more friction (b) less friction
37. 37.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a tyre with deep treads (d) a smooth steel slide
39. 39.True or false: a grippy rubber sole gives more friction. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful

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