Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 15 · 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) less friction (b) more friction
2. 2.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a grippy rubber sole (d) a tyre with deep treads
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 14 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) skating on ice (d) a wet tiled floor
12. 12.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a rough doormat
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a rough doormat (d) a tyre with deep treads
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) oil on a squeaky hinge (d) a tyre with deep treads
19. 19.True or false: powder on a carrom board gives more friction. (a) False (b) True
20. 20.🛞 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 6 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
21. 21.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.True or false: sand on a slippery path 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: a glass sheet 3 N, a wooden plank 6 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
25. 25.True or false: a rough doormat gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
27. 27.True or false: a grippy rubber sole gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
35. 35.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
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 tyre with deep treads (b) sand on a slippery path (c) a wheel on ball bearings (d) chalk on a gym bar

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