Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 804 · 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: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
2. 2.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
6. 6.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
9. 9.True or false: chalk on a gym bar gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a wet tiled floor
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a rough doormat (d) oil on a squeaky hinge
13. 13.🛞 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 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) powder on a carrom board (d) skating on ice
15. 15.True or false: skating on ice gives more friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) skating on ice (d) a smooth steel slide
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.True or false: a grippy rubber sole gives more friction. (a) False (b) True
26. 26.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
27. 27.🛞 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 12 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
30. 30.True or false: sand on a slippery path gives less friction. (a) False (b) True
31. 31.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
33. 33.🛞 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 glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) oil on a squeaky hinge
36. 36.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
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 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wet tiled floor
39. 39.True or false: powder on a carrom board gives less friction. (a) False (b) True
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 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet

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