Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 943 · 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.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
2. 2.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wet tiled floor (d) powder on a carrom board
5. 5.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
10. 10.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
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 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wheel on ball bearings (d) a grippy rubber sole
18. 18.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
23. 23.True or false: a rough doormat gives less friction. (a) False (b) True
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
25. 25.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a wet tiled floor (d) oil on a squeaky hinge
26. 26.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
28. 28.🛞 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 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) sand on a slippery path (d) a box pushed on carpet
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a rough doormat (d) a smooth steel slide
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet

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