Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 907 · 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 wooden plank 2 N, a carpet 3 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a wet tiled floor (d) oil on a squeaky hinge
3. 3.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) powder on a carrom board (d) a smooth steel slide
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.True or false: powder on a carrom board gives less friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) chalk on a gym bar (d) a box pushed on carpet
13. 13.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
15. 15.True or false: a rough doormat gives less friction. (a) False (b) True
16. 16.True or false: a tyre with deep treads 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 wooden plank 6 N, sandpaper 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
18. 18.True or false: a smooth steel slide gives less friction. (a) True (b) False
19. 19.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
23. 23.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) powder on a carrom board (d) chalk on a gym bar
24. 24.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
27. 27.True or false: a box pushed on carpet gives more friction. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) a rough doormat
29. 29.True or false: a smooth steel slide gives more friction. (a) False (b) True
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.True or false: a rough doormat gives more friction. (a) False (b) True
32. 32.True or false: skating on ice gives less friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
36. 36.True or false: a wet tiled floor gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 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 8 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
40. 40.🛞 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 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice

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