Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 267 · 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: gripping a cricket bat? (a) a problem (b) helpful
2. 2.🛞 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 wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
3. 3.🛞 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. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
5. 5.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
6. 6.True or false: a smooth steel slide gives less friction. (a) True (b) False
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
8. 8.🛞 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, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) skating on ice (d) powder on a carrom board
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
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 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a tyre with deep treads (d) a rough doormat
18. 18.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
20. 20.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
21. 21.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a smooth steel slide (d) a wheel on ball bearings
23. 23.🛞 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 most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
25. 25.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
27. 27.🛞 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 wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.🛞 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 10 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
36. 36.True or false: chalk on a gym bar gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
38. 38.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
39. 39.True or false: a wheel on ball bearings 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: ice 3 N, a glass sheet 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?

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