Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 890 · 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.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
2. 2.True or false: a smooth steel slide gives less friction. (a) True (b) False
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) a rough doormat
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
8. 8.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
9. 9.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
10. 10.True or false: a rough doormat gives more friction. (a) False (b) True
11. 11.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.True or false: sand on a slippery path gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
23. 23.True or false: a smooth steel slide gives more friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
25. 25.True or false: a grippy rubber sole gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) powder on a carrom board (d) skating on ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
30. 30.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
32. 32.True or false: powder on a carrom board gives less friction. (a) True (b) False
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) a wet tiled floor
37. 37.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a box pushed on carpet (d) skating on ice
38. 38.True or false: chalk on a gym bar gives more friction. (a) False (b) True
39. 39.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
40. 40.True or false: a rough doormat gives less friction. (a) False (b) True

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