Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 385 · 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.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) a tyre with deep treads
4. 4.True or false: a box pushed on carpet gives more friction. (a) True (b) False
5. 5.True or false: sand on a slippery path gives less friction. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a wet tiled floor (d) oil on a squeaky hinge
7. 7.🛞 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 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 10 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
11. 11.🛞 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, a carpet 6 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
12. 12.True or false: powder on a carrom board gives more friction. (a) True (b) False
13. 13.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) skating on ice (d) a smooth steel slide
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
17. 17.True or false: sand on a slippery path gives more friction. (a) True (b) False
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
19. 19.True or false: a tyre with deep treads gives more friction. (a) True (b) False
20. 20.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
23. 23.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a box pushed on carpet (d) sand on a slippery path
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
26. 26.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a grippy rubber sole (d) a box pushed on carpet
27. 27.🛞 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 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wet tiled floor (d) a rough doormat
29. 29.True or false: chalk on a gym bar gives more friction. (a) False (b) True
30. 30.True or false: a box pushed on carpet gives less friction. (a) False (b) True
31. 31.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
32. 32.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wet tiled floor (d) a box pushed on carpet
34. 34.🛞 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 wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
39. 39.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank

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