Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 673 · 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: powder on a carrom board? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) oil on a squeaky hinge (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 2 N, a carpet 3 N, sandpaper 5 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
7. 7.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
8. 8.True or false: skating on ice gives less friction. (a) False (b) True
9. 9.True or false: skating on ice gives more friction. (a) False (b) True
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) a rough doormat
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.True or false: a grippy rubber sole gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) chalk on a gym bar (d) a smooth steel slide
17. 17.True or false: a smooth steel slide gives less friction. (a) True (b) False
18. 18.🛞 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 carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.True or false: a grippy rubber sole gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a wet tiled floor (d) skating on ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
29. 29.🛞 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 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) oil on a squeaky hinge
31. 31.True or false: a tyre with deep treads gives more friction. (a) True (b) False
32. 32.True or false: a wet tiled floor gives less friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) powder on a carrom board (d) a rough doormat
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) oil on a squeaky hinge
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wheel on ball bearings (d) chalk on a gym bar
39. 39.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a rough doormat (d) a smooth steel slide
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank

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