Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 860 · 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.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
2. 2.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.True or false: a box pushed on carpet gives less friction. (a) False (b) True
7. 7.True or false: powder on a carrom board gives more friction. (a) False (b) True
8. 8.True or false: chalk on a gym bar gives less friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.True or false: a rough doormat gives more friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wet tiled floor (d) sand on a slippery path
13. 13.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) oil on a squeaky hinge
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) oil on a squeaky hinge (d) powder on a carrom board
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
20. 20.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
22. 22.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
23. 23.🛞 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 10 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wheel on ball bearings (d) a smooth steel slide
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.True or false: a tyre with deep treads gives more friction. (a) False (b) True
27. 27.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
29. 29.True or false: a grippy rubber sole gives less friction. (a) False (b) True
30. 30.True or false: powder on a carrom board gives less friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a box pushed on carpet (d) skating on ice
34. 34.True or false: a wet tiled floor gives more friction. (a) True (b) False
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction

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