Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 473 · 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 4 N, a carpet 5 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
2. 2.True or false: chalk on a gym bar gives more friction. (a) True (b) False
3. 3.True or false: skating on ice gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) powder on a carrom board (d) skating on ice
5. 5.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a box pushed on carpet (d) a smooth steel slide
7. 7.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
8. 8.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
9. 9.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
10. 10.True or false: a wet tiled floor gives more friction. (a) False (b) True
11. 11.True or false: a smooth steel slide gives more friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) sand on a slippery path (d) a wheel on ball bearings
13. 13.True or false: chalk on a gym bar gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
17. 17.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) powder on a carrom board (d) a grippy rubber sole
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a smooth steel slide (d) a wet tiled floor
25. 25.True or false: sand on a slippery path 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: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a grippy rubber sole (d) a smooth steel slide
28. 28.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🛞 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, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
38. 38.True or false: a box pushed on carpet gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 15 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
40. 40.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful

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