Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 779 · 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.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wheel on ball bearings (d) oil on a squeaky hinge
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 15 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
5. 5.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
6. 6.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a box pushed on carpet (d) oil on a squeaky hinge
9. 9.True or false: a box pushed on carpet gives more friction. (a) True (b) False
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 7 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.True or false: chalk on a gym bar gives less friction. (a) False (b) True
15. 15.True or false: a rough doormat gives more friction. (a) False (b) True
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
17. 17.True or false: skating on ice gives more friction. (a) True (b) False
18. 18.True or false: sand on a slippery path gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
22. 22.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 5 N, a carpet 8 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) sand on a slippery path (c) a box pushed on carpet (d) oil on a squeaky hinge
29. 29.True or false: a tyre with deep treads gives more friction. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a grippy rubber sole (d) powder on a carrom board
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
32. 32.True or false: a grippy rubber sole gives less friction. (a) False (b) True
33. 33.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, sandpaper 16 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
36. 36.True or false: a tyre with deep treads gives less friction. (a) True (b) False
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.True or false: powder on a carrom board gives less friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a rough doormat (d) a smooth steel slide
40. 40.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper

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