Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 234 · 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 grippy rubber sole? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
4. 4.True or false: a tyre with deep treads gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
6. 6.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
7. 7.True or false: a rough doormat gives more friction. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a wheel on ball bearings (d) a smooth steel slide
9. 9.🛞 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 3 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (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 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 10 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.True or false: sand on a slippery path gives less friction. (a) True (b) False
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
17. 17.🛞 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. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
18. 18.True or false: a tyre with deep treads gives more friction. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a wheel on ball bearings (d) chalk on a gym bar
20. 20.True or false: chalk on a gym bar gives less friction. (a) True (b) False
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) powder on a carrom board
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wheel on ball bearings (d) a grippy rubber sole
28. 28.🛞 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 carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a tyre with deep treads
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
33. 33.True or false: a smooth steel slide gives less friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
35. 35.True or false: a grippy rubber sole gives less friction. (a) True (b) False
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
38. 38.🛞 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 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
39. 39.🛞 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 wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice

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