Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 351 · 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.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
3. 3.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.True or false: powder on a carrom board gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
8. 8.🛞 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 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
9. 9.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) sand on a slippery path (d) oil on a squeaky hinge
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
14. 14.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
15. 15.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
18. 18.True or false: a smooth steel slide gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) powder on a carrom board (d) skating on ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.True or false: powder on a carrom board gives less friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a box pushed on carpet (d) a smooth steel slide
26. 26.True or false: a wet tiled floor 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 glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
37. 37.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
38. 38.🛞 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 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) a rough doormat

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