Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 367 · 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: sand on a slippery path? (a) less friction (b) more friction
2. 2.True or false: a smooth steel slide gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wheel on ball bearings (d) a wet tiled floor
5. 5.🛞 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 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
6. 6.True or false: a rough doormat gives less friction. (a) True (b) False
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a box pushed on carpet (d) powder on a carrom board
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
10. 10.🛞 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, sandpaper 12 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a smooth steel slide (d) a wheel on ball bearings
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
16. 16.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
19. 19.True or false: skating on ice gives less friction. (a) True (b) False
20. 20.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
22. 22.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
23. 23.True or false: a wet tiled floor gives less friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
27. 27.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
33. 33.True or false: a tyre with deep treads gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?

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