Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 556 · 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: a smooth steel slide gives less friction. (a) True (b) False
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wet tiled floor
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) a smooth steel slide
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
10. 10.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 9 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.🛞 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) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
14. 14.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) powder on a carrom board (d) skating on ice
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
17. 17.True or false: a tyre with deep treads gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
19. 19.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
21. 21.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) sand on a slippery path (d) a wheel on ball bearings
23. 23.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
24. 24.True or false: sand on a slippery path gives less friction. (a) False (b) True
25. 25.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on a carpet than on ice?
35. 35.True or false: a wet tiled floor gives less friction. (a) True (b) False
36. 36.🛞 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, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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