Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 422 · 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.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
2. 2.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) sand on a slippery path (d) skating on ice
4. 4.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
5. 5.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
6. 6.True or false: a rough doormat gives less friction. (a) True (b) False
7. 7.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
8. 8.True or false: a grippy rubber sole gives more friction. (a) False (b) True
9. 9.True or false: sand on a slippery path gives more friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
12. 12.True or false: a rough doormat gives more friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a grippy rubber sole (d) sand on a slippery path
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a box pushed on carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
21. 21.🛞 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 9 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wheel on ball bearings (d) powder on a carrom board
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.True or false: a wet tiled floor gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) a wheel on ball bearings
26. 26.True or false: sand on a slippery path gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.True or false: a box pushed on carpet gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) sand on a slippery path (d) a smooth steel slide
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
37. 37.True or false: a tyre with deep treads gives less friction. (a) True (b) False
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat

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