Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 795 · 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 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.True or false: a grippy rubber sole gives more friction. (a) True (b) False
7. 7.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a smooth steel slide (d) a wheel on ball bearings
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a wet tiled floor (d) a wheel on ball bearings
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a wet tiled floor (d) a smooth steel slide
15. 15.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
16. 16.True or false: a wet tiled floor gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a tyre with deep treads (d) oil on a squeaky hinge
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.🛞 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 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
27. 27.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
29. 29.True or false: a box pushed on carpet gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
34. 34.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) a smooth steel slide
38. 38.True or false: sand on a slippery path 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 wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
40. 40.🛞 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 wooden plank 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet

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