Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 857 · 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.True or false: chalk on a gym bar gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) chalk on a gym bar
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) sand on a slippery path (d) oil on a squeaky hinge
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
13. 13.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
14. 14.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) sand on a slippery path (d) a smooth steel slide
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.True or false: a box pushed on carpet gives more friction. (a) True (b) False
26. 26.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a rough doormat (d) skating on ice
34. 34.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
37. 37.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
39. 39.🛞 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 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice

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