Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 219 · 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.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
5. 5.True or false: powder on a carrom board gives less friction. (a) False (b) True
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
8. 8.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
12. 12.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
13. 13.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
16. 16.True or false: skating on ice gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a grippy rubber sole (d) a tyre with deep treads
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wheel on ball bearings (d) a tyre with deep treads
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) chalk on a gym bar (d) a grippy rubber sole
24. 24.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
25. 25.🛞 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 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
33. 33.True or false: a wet tiled floor gives more friction. (a) False (b) True
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
36. 36.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) sand on a slippery path (d) skating on ice
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a rough doormat gives less friction. (a) True (b) False

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