Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 231 · 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 glass sheet 8 N, a wooden plank 9 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
9. 9.🛞 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 carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a tyre with deep treads (d) a box pushed on carpet
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wet tiled floor (d) a rough doormat
19. 19.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
21. 21.🔍 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
22. 22.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) a wheel on ball bearings
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) sand on a slippery path (d) a wheel on ball bearings
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) skating on ice (d) powder on a carrom board
27. 27.🛞 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, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
28. 28.True or false: sand on a slippery path gives more friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
31. 31.True or false: chalk on a gym bar gives less friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
35. 35.True or false: skating on ice gives less friction. (a) False (b) True
36. 36.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
37. 37.🛞 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, ice 1 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet

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