Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 289 · 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: dragging a heavy box? (a) helpful (b) a problem
2. 2.True or false: skating on ice gives less friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) a box pushed on carpet
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
10. 10.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
13. 13.True or false: a grippy rubber sole gives more friction. (a) False (b) True
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
15. 15.🛞 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, a carpet 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a smooth steel slide (d) powder on a carrom board
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
19. 19.🛞 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 glass sheet (b) sandpaper (c) a carpet (d) ice
20. 20.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
21. 21.True or false: a wet tiled floor gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) oil on a squeaky hinge (d) powder on a carrom board
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 12 N, a carpet 13 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
24. 24.🛞 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 11 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
26. 26.True or false: powder on a carrom board 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: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
29. 29.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) oil on a squeaky hinge (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wheel on ball bearings (d) skating on ice
32. 32.True or false: a box pushed on carpet gives more friction. (a) False (b) True
33. 33.True or false: chalk on a gym bar gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
35. 35.True or false: oil on a squeaky hinge 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 glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
39. 39.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank

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