Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 842 · 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.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a grippy rubber sole
9. 9.🛞 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 8 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a smooth steel slide (d) a rough doormat
11. 11.True or false: a tyre with deep treads gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
13. 13.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
14. 14.True or false: skating on ice gives more friction. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) a rough doormat
16. 16.True or false: a rough doormat gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
18. 18.🛞 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 6 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
24. 24.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
25. 25.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
26. 26.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.🛞 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 4 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
32. 32.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
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 3 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wheel on ball bearings (d) a grippy rubber sole
40. 40.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road

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