Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 154 · 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) a wheel on ball bearings (d) a tyre with deep treads
2. 2.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
3. 3.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a tyre with deep treads (d) a box pushed on carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
11. 11.True or false: a rough doormat gives less friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a smooth steel slide (d) powder on a carrom board
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.🛞 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 wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
16. 16.True or false: a grippy rubber sole gives less friction. (a) False (b) True
17. 17.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
18. 18.🛞 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 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
20. 20.True or false: sand on a slippery path gives more friction. (a) False (b) True
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: chalk on a gym bar gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
31. 31.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
32. 32.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
33. 33.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
35. 35.True or false: skating on ice gives less friction. (a) True (b) False
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
39. 39.True or false: a smooth steel slide gives more friction. (a) False (b) True
40. 40.True or false: chalk on a gym bar gives less friction. (a) False (b) True

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