Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 412 · 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 surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) chalk on a gym bar (d) oil on a squeaky hinge
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
9. 9.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
11. 11.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
15. 15.🛞 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, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) sand on a slippery path (d) a grippy rubber sole
17. 17.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a rough doormat (d) sand on a slippery path
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
20. 20.True or false: sand on a slippery path gives less friction. (a) False (b) True
21. 21.True or false: a grippy rubber sole gives less friction. (a) True (b) False
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 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, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
37. 37.🛞 More or less friction: powder on a carrom board? (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 6 N, a wooden plank 10 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a wet tiled floor (d) a tyre with deep treads
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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