Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 627 · 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: skating on ice gives more friction. (a) False (b) True
2. 2.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
3. 3.True or false: sand on a slippery path gives less friction. (a) True (b) False
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.True or false: a rough doormat gives less friction. (a) False (b) True
8. 8.True or false: a grippy rubber sole gives more friction. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a rough doormat (d) a smooth steel slide
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a grippy rubber sole
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
12. 12.True or false: a tyre with deep treads gives more friction. (a) True (b) False
13. 13.🛞 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 7 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a wet tiled floor (d) a box pushed on carpet
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 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, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
21. 21.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
23. 23.True or false: sand on a slippery path gives more friction. (a) True (b) False
24. 24.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
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 2 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
30. 30.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a grippy rubber sole (d) a rough doormat
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wheel on ball bearings (d) skating on ice
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a rough doormat (d) skating on ice
38. 38.True or false: a smooth steel slide gives less friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) sand on a slippery path (d) chalk on a gym bar
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet

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