Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 320 · 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) a box pushed on carpet (b) chalk on a gym bar (c) skating on ice (d) a rough doormat
2. 2.True or false: skating on ice gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a wet tiled floor (d) a wheel on ball bearings
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) chalk on a gym bar
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 12 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.True or false: a smooth steel slide gives more friction. (a) True (b) False
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
15. 15.True or false: a grippy rubber sole gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.True or false: a rough doormat gives more friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wet tiled floor (d) a wheel on ball bearings
25. 25.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
28. 28.True or false: a rough doormat gives less friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
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 carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.🛞 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 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
32. 32.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
34. 34.True or false: sand on a slippery path gives less friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a grippy rubber sole (d) sand on a slippery path
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) a wheel on ball bearings
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
40. 40.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice

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