Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 745 · 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) skating on ice (b) a rough doormat (c) a wet tiled floor (d) powder on a carrom board
2. 2.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
4. 4.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
5. 5.True or false: sand on a slippery path gives more friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.True or false: a rough doormat gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
13. 13.True or false: a grippy rubber sole gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
15. 15.True or false: a smooth steel slide gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
18. 18.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a smooth steel slide (d) oil on a squeaky hinge
20. 20.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a grippy rubber sole
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 15 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
26. 26.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wet tiled floor (d) sand on a slippery path
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) skating on ice (d) a grippy rubber sole
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.True or false: powder on a carrom board gives less friction. (a) False (b) True
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 8 N, a carpet 10 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 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
35. 35.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
36. 36.🛞 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, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) a smooth steel slide
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
40. 40.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic

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