Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 48 · 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: a grippy rubber sole gives less friction. (a) False (b) True
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
7. 7.True or false: a box pushed on carpet gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🛞 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 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
16. 16.True or false: a wet tiled floor gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) skating on ice (d) sand on a slippery path
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wheel on ball bearings (d) chalk on a gym bar
22. 22.🔍 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
23. 23.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
25. 25.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
26. 26.True or false: a wet tiled floor gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.True or false: a rough doormat 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 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
37. 37.🛞 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, a carpet 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
38. 38.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
39. 39.True or false: powder on a carrom board gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet

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