Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 179 · 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.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) skating on ice (d) a wet tiled floor
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
9. 9.True or false: skating on ice gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more 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 wooden plank 10 N, a carpet 13 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
14. 14.True or false: sand on a slippery path gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a grippy rubber sole
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) skating on ice (d) a smooth steel slide
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
25. 25.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
27. 27.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
28. 28.🛞 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, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
29. 29.True or false: skating on ice gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a tyre with deep treads (d) skating on ice
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) powder on a carrom board (d) oil on a squeaky hinge
32. 32.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
33. 33.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a wheel on ball bearings (d) a tyre with deep treads
40. 40.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful

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