Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 149 · 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 knot holding a rope? (a) helpful (b) a problem
2. 2.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) a wheel on ball bearings
5. 5.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
6. 6.True or false: a rough doormat gives more friction. (a) False (b) True
7. 7.True or false: chalk on a gym bar gives less friction. (a) True (b) False
8. 8.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
10. 10.🛞 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 5 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) skating on ice (d) oil on a squeaky hinge
12. 12.True or false: oil on a squeaky hinge 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: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) powder on a carrom board (d) a grippy rubber sole
17. 17.True or false: a wet tiled floor gives less friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a grippy rubber sole (d) a smooth steel slide
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
24. 24.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
25. 25.True or false: a tyre with deep treads gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
28. 28.True or false: skating on ice gives more friction. (a) True (b) False
29. 29.True or false: a wet tiled floor gives more friction. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a smooth steel slide (d) chalk on a gym bar
34. 34.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
35. 35.🔍 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 box pushed on carpet
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.True or false: sand on a slippery path gives less friction. (a) True (b) False
40. 40.🛞 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 4 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet

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