Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 342 · 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 wheel on ball bearings? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a wet tiled floor (d) a smooth steel slide
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) a wet tiled floor
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) oil on a squeaky hinge (d) a grippy rubber sole
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) sand on a slippery path (d) oil on a squeaky hinge
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
16. 16.True or false: a wet tiled floor gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) a rough doormat
23. 23.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.True or false: skating on ice gives less friction. (a) True (b) False
27. 27.True or false: a smooth steel slide gives less friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a rough doormat (d) sand on a slippery path
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
32. 32.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a smooth steel slide (d) powder on a carrom board
33. 33.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
37. 37.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
38. 38.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
39. 39.🛞 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 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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