Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 889 · 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 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
2. 2.🛞 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 carpet 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.True or false: chalk on a gym bar gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
9. 9.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a tyre with deep treads (d) a box pushed on carpet
11. 11.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a smooth steel slide
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a wet tiled floor
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 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 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
18. 18.True or false: a wet tiled floor gives less friction. (a) False (b) True
19. 19.True or false: a grippy rubber sole gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a grippy rubber sole
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
24. 24.🔍 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 rough doormat
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 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 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
28. 28.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.🛞 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 wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction

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