Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 356 · 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: oil on a squeaky hinge gives more friction. (a) False (b) True
2. 2.True or false: a wet tiled floor gives less friction. (a) True (b) False
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a smooth steel slide
9. 9.True or false: powder on a carrom board gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
11. 11.🛞 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 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
12. 12.🛞 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 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) oil on a squeaky hinge (d) powder on a carrom board
15. 15.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
21. 21.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a wet tiled floor (d) a wheel on ball bearings
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
24. 24.True or false: powder on a carrom board gives less friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
26. 26.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) chalk on a gym bar (d) a wet tiled floor
27. 27.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
28. 28.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
30. 30.🛞 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 9 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
32. 32.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
33. 33.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
34. 34.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a rough doormat (d) a tyre with deep treads
36. 36.True or false: a smooth steel slide gives more friction. (a) False (b) True
37. 37.🛞 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 12 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
38. 38.True or false: a grippy rubber sole gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a grippy rubber sole (d) a box pushed on carpet

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