Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 243 · 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.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a box pushed on carpet (d) a rough doormat
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
4. 4.🛞 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, sandpaper 11 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
6. 6.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
9. 9.🛞 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) a wooden plank (b) ice (c) a carpet (d) sandpaper
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
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 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) skating on ice
13. 13.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
14. 14.True or false: skating on ice gives more friction. (a) False (b) True
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
17. 17.True or false: a grippy rubber sole gives more friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a rough doormat
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
22. 22.True or false: a wet tiled floor gives more friction. (a) True (b) False
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.True or false: skating on ice gives less friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
27. 27.True or false: a box pushed on carpet 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: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
30. 30.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) sand on a slippery path (d) a smooth steel slide
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
34. 34.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a box pushed on carpet (d) sand on a slippery path
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet

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