Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 251 · 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 is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) powder on a carrom board
2. 2.True or false: a grippy rubber sole gives less friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) a wet tiled floor
4. 4.🛞 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 6 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
11. 11.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a smooth steel slide (d) sand on a slippery path
13. 13.True or false: a wet tiled floor gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.True or false: sand on a slippery path gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) sand on a slippery path
18. 18.🛞 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. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) skating on ice (d) chalk on a gym bar
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: chalk on a gym bar gives less friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a smooth steel slide (d) chalk on a gym bar
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
28. 28.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 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, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
33. 33.True or false: powder on a carrom board gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
35. 35.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
36. 36.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
38. 38.True or false: a smooth steel slide gives more friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper

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