Engineering Worksheet: Friction

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

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