Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 677 · 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.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
4. 4.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) sand on a slippery path (d) skating on ice
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
9. 9.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) a wheel on ball bearings
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
13. 13.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
14. 14.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a wheel on ball bearings (d) powder on a carrom board
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a box pushed on carpet (d) a smooth steel slide
21. 21.True or false: powder on a carrom board gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
23. 23.True or false: a box pushed on carpet gives less friction. (a) False (b) True
24. 24.🛞 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 wooden plank 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 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 carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
26. 26.🛞 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 carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
29. 29.True or false: a rough doormat gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.True or false: a tyre with deep treads gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
36. 36.True or false: a rough doormat gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
38. 38.True or false: a grippy rubber sole gives less friction. (a) False (b) True
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
40. 40.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice

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