Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 246 · 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.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
2. 2.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
8. 8.True or false: skating on ice gives less friction. (a) False (b) True
9. 9.True or false: a wet tiled floor gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) powder on a carrom board (d) a grippy rubber sole
13. 13.True or false: powder on a carrom board gives more friction. (a) False (b) True
14. 14.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a smooth steel slide
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
22. 22.True or false: a wet tiled floor gives less friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
24. 24.True or false: a tyre with deep treads gives less friction. (a) True (b) False
25. 25.🛞 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 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.True or false: a grippy rubber sole gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
30. 30.🛞 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 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
33. 33.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
35. 35.True or false: a box pushed on carpet gives less friction. (a) False (b) True
36. 36.True or false: sand on a slippery path 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 glass sheet 5 N, a carpet 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 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 wooden plank 8 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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