Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 264 · 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: powder on a carrom board gives less friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
4. 4.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a box pushed on carpet (d) sand on a slippery path
6. 6.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) a wet tiled floor
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a wet tiled floor (d) a wheel on ball bearings
11. 11.True or false: a wet tiled floor gives more friction. (a) False (b) True
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
13. 13.True or false: a rough doormat gives less friction. (a) False (b) True
14. 14.🛞 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, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
15. 15.True or false: sand on a slippery path gives more friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
20. 20.True or false: a box pushed on carpet gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a tyre with deep treads (d) a rough doormat
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
33. 33.True or false: chalk on a gym bar gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.True or false: a rough doormat gives more friction. (a) True (b) False
36. 36.True or false: a tyre with deep treads 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 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a tyre with deep treads (d) chalk on a gym bar

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