Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 270 · 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.🛞 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 6 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a smooth steel slide (d) a grippy rubber sole
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) skating on ice (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 carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
12. 12.True or false: sand on a slippery path gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
18. 18.True or false: chalk on a gym bar gives less friction. (a) True (b) False
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) a tyre with deep treads
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
25. 25.True or false: a rough doormat gives less friction. (a) True (b) False
26. 26.🛞 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 least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
27. 27.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
28. 28.True or false: powder on a carrom board gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
36. 36.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
37. 37.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) skating on ice (d) sand on a slippery path
39. 39.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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