Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 822 · 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.True or false: a tyre with deep treads gives less friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
4. 4.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
5. 5.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
7. 7.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
8. 8.True or false: a wet tiled floor gives less friction. (a) False (b) True
9. 9.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
11. 11.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
12. 12.True or false: a tyre with deep treads gives more friction. (a) True (b) False
13. 13.True or false: chalk on a gym bar gives more friction. (a) False (b) True
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
19. 19.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) powder on a carrom board (d) a rough doormat
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
26. 26.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
27. 27.True or false: a rough doormat gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
32. 32.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 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, a carpet 13 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a tyre with deep treads (d) a rough doormat
36. 36.🛞 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. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
37. 37.True or false: powder on a carrom board gives less friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) sand on a slippery path (d) a rough doormat
39. 39.True or false: a wet tiled floor gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice

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