Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 63 · 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 more friction. (a) True (b) False
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a box pushed on carpet (d) a smooth steel slide
4. 4.True or false: chalk on a gym bar gives less friction. (a) False (b) True
5. 5.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.True or false: a wet tiled floor gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wet tiled floor (d) a grippy rubber sole
13. 13.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: chalk on a gym bar gives more friction. (a) False (b) True
16. 16.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
18. 18.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
21. 21.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a box pushed on carpet (d) a rough doormat
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
29. 29.🛞 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 wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
30. 30.🛞 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 3 N. How many newtons more were needed on a carpet than on ice?
31. 31.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) sand on a slippery path (d) a grippy rubber sole
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) skating on ice (d) oil on a squeaky hinge
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
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 carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.True or false: skating on ice gives less friction. (a) False (b) True
39. 39.🛞 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 10 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
40. 40.🛞 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 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet

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