Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 187 · 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.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
2. 2.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
3. 3.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
5. 5.True or false: a tyre with deep treads gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
8. 8.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
10. 10.🛞 More or less friction: a wheel on ball bearings? (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 glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.🛞 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 11 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
14. 14.True or false: a box pushed on carpet gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
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 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
19. 19.True or false: powder on a carrom board gives more friction. (a) True (b) False
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a wet tiled floor (d) a box pushed on carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
26. 26.🛞 More or less friction: powder on a carrom board? (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 carpet 7 N, sandpaper 8 N, ice 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a wheel on ball bearings (d) a rough doormat
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) skating on ice (d) sand on a slippery path
33. 33.True or false: skating on ice gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a wheel on ball bearings (d) a smooth steel slide
37. 37.🔍 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 rough doormat
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
40. 40.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice

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