Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 77 · 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.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice
2. 2.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: a tyre with deep treads gives more friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
7. 7.True or false: a box pushed on carpet gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a tyre with deep treads (d) sand on a slippery path
9. 9.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a tyre with deep treads (d) a smooth steel slide
10. 10.True or false: a smooth steel slide gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wet tiled floor (d) a rough doormat
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
16. 16.True or false: a grippy rubber sole gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) a wheel on ball bearings
19. 19.True or false: a grippy rubber sole gives more 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 8 N, sandpaper 11 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
23. 23.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.True or false: a tyre with deep treads gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a wheel on ball bearings (d) a wet tiled floor
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 6 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids