Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 563 · 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: skating on ice? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
3. 3.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a tyre with deep treads (d) a rough doormat
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
6. 6.True or false: a rough doormat gives more friction. (a) False (b) True
7. 7.🛞 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 9 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
8. 8.True or false: a smooth steel slide gives less friction. (a) True (b) False
9. 9.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
10. 10.True or false: skating on ice gives more friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) oil on a squeaky hinge
12. 12.🛞 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 11 N, sandpaper 15 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) oil on a squeaky hinge (d) powder on a carrom board
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
17. 17.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.True or false: chalk on a gym bar gives less friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) skating on ice (d) sand on a slippery path
21. 21.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a smooth steel slide (d) chalk on a gym bar
22. 22.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
23. 23.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
24. 24.🛞 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 wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
28. 28.True or false: powder on a carrom board gives less friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
30. 30.True or false: sand on a slippery path gives more friction. (a) True (b) False
31. 31.True or false: a grippy rubber sole gives more friction. (a) True (b) False
32. 32.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
33. 33.🛞 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, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
39. 39.True or false: a tyre with deep treads gives less friction. (a) False (b) True
40. 40.True or false: a box pushed on carpet gives less friction. (a) True (b) False

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