Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 110 · 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) chalk on a gym bar (b) a grippy rubber sole (c) skating on ice (d) a rough doormat
2. 2.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) powder on a carrom board (d) a wet tiled floor
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
4. 4.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🛞 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 8 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.True or false: sand on a slippery path gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat
15. 15.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.True or false: a smooth steel slide gives more friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
21. 21.True or false: a tyre with deep treads gives more friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a tyre with deep treads (d) a box pushed on carpet
23. 23.True or false: sand on a slippery path gives less friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) a rough doormat
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
26. 26.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
29. 29.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
30. 30.🛞 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 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
33. 33.True or false: a rough doormat gives less friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) sand on a slippery path (d) a wet tiled floor
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
39. 39.🛞 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 9 N, a carpet 13 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?

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