Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 209 · 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 box pushed on carpet gives less friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
3. 3.True or false: powder on a carrom board gives more friction. (a) True (b) False
4. 4.True or false: a wet tiled floor gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) powder on a carrom board (d) a rough doormat
6. 6.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) a wheel on ball bearings
14. 14.🛞 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. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a wet tiled floor? (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, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
19. 19.True or false: a wet tiled floor gives more friction. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: skating on ice gives less friction. (a) False (b) True
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
25. 25.True or false: a smooth steel slide gives less friction. (a) True (b) False
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.🛞 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 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, a carpet 16 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
32. 32.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a smooth steel slide (d) oil on a squeaky hinge
33. 33.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
34. 34.True or false: skating on ice gives more friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) oil on a squeaky hinge (d) a grippy rubber sole
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a tyre with deep treads (d) a smooth steel slide
38. 38.True or false: chalk on a gym bar gives more friction. (a) True (b) False
39. 39.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) sand on a slippery path

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