Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 746 · 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: a tyre with deep treads? (a) more friction (b) less friction
2. 2.True or false: sand on a slippery path gives more friction. (a) True (b) False
3. 3.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
6. 6.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
7. 7.🛞 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 carpet (c) a glass sheet (d) a wooden plank
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, sandpaper 16 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.True or false: a smooth steel slide gives less friction. (a) True (b) False
15. 15.🛞 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 wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) powder on a carrom board (d) a tyre with deep treads
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a box pushed on carpet (d) a wheel on ball bearings
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
25. 25.🛞 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 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
26. 26.True or false: oil on a squeaky hinge 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 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
28. 28.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
33. 33.True or false: skating on ice gives more friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a smooth steel slide (d) a grippy rubber sole
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
38. 38.True or false: powder on a carrom board gives less friction. (a) True (b) False
39. 39.🛞 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 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on a carpet than on ice?

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