Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 331 · 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 wooden plank 7 N, a carpet 11 N, sandpaper 15 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) a wet tiled floor
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
12. 12.True or false: a grippy rubber sole gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
17. 17.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
21. 21.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
23. 23.True or false: powder on a carrom board gives more friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) chalk on a gym bar
25. 25.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
26. 26.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
27. 27.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
28. 28.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.True or false: a box pushed on carpet gives less friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
32. 32.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
33. 33.🛞 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, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
34. 34.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor

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