Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 307 · 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) powder on a carrom board (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
2. 2.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
3. 3.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a box pushed on carpet
5. 5.True or false: a grippy rubber sole gives less friction. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a wet tiled floor (d) chalk on a gym bar
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.True or false: a box pushed on carpet gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 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 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
17. 17.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
19. 19.🛞 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 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a rough doormat (d) powder on a carrom board
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
26. 26.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
27. 27.🛞 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 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a rough doormat (d) a box pushed on carpet
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.True or false: a box pushed on carpet gives less friction. (a) True (b) False
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.True or false: a grippy rubber sole gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
36. 36.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) chalk on a gym bar (d) a smooth steel slide
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
39. 39.True or false: a smooth steel slide gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank

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