Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 383 · 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.True or false: a wet tiled floor gives more friction. (a) False (b) True
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) skating on ice (d) powder on a carrom board
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a rough doormat (d) a tyre with deep treads
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) oil on a squeaky hinge
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
13. 13.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
15. 15.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
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 glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
23. 23.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
26. 26.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) skating on ice (d) a tyre with deep treads
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) skating on ice (d) a box pushed on carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
30. 30.True or false: sand on a slippery path gives more friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) powder on a carrom board (d) chalk on a gym bar
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
33. 33.True or false: a wheel on ball bearings 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: a carpet 9 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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