Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 283 · 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) sand on a slippery path (b) powder on a carrom board (c) a tyre with deep treads (d) a grippy rubber sole
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
4. 4.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
5. 5.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
9. 9.True or false: powder on a carrom board gives more friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.True or false: a grippy rubber sole gives more friction. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 13 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) sand on a slippery path (d) a tyre with deep treads
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a rough doormat (d) a smooth steel slide
15. 15.True or false: skating on ice gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
17. 17.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
18. 18.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a box pushed on carpet (d) a grippy rubber sole
20. 20.True or false: a rough doormat gives less friction. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) powder on a carrom board (d) skating on ice
22. 22.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
23. 23.True or false: a wet tiled floor gives less friction. (a) True (b) False
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.True or false: powder on a carrom board gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
31. 31.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
35. 35.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
39. 39.True or false: skating on ice gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice

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