Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 836 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.True or false: a smooth steel slide gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
12. 12.True or false: a grippy rubber sole gives less friction. (a) False (b) True
13. 13.True or false: a tyre with deep treads gives more friction. (a) False (b) True
14. 14.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
17. 17.🛞 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 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a smooth steel slide (d) chalk on a gym bar
19. 19.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a wet tiled floor (d) skating on ice
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
21. 21.True or false: a rough doormat gives less friction. (a) False (b) True
22. 22.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
23. 23.True or false: a wet tiled floor gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
26. 26.True or false: powder on a carrom board gives less friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wheel on ball bearings (d) a tyre with deep treads
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a wheel on ball bearings (d) sand on a slippery path
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) powder on a carrom board (d) chalk on a gym bar
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wet tiled floor (d) a rough doormat
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?

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