Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 924 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
3. 3.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) sand on a slippery path (d) a rough doormat
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.True or false: a wet tiled floor gives more friction. (a) False (b) True
18. 18.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
20. 20.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
21. 21.True or false: a wet tiled floor gives less friction. (a) True (b) False
22. 22.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet
25. 25.🛞 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, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
27. 27.🛞 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 wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
29. 29.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
30. 30.🛞 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, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
31. 31.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a rough doormat (d) a box pushed on carpet
32. 32.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🛞 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 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
35. 35.True or false: a rough doormat gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
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: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
40. 40.🛞 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 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice

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