Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 434 · 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.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
2. 2.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
3. 3.True or false: oil on a squeaky hinge 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: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 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, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
9. 9.🛞 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 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
11. 11.True or false: powder on a carrom board gives more friction. (a) False (b) True
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
13. 13.True or false: a smooth steel slide gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a smooth steel slide (d) a tyre with deep treads
18. 18.True or false: chalk on a gym bar gives more friction. (a) False (b) True
19. 19.True or false: a box pushed on carpet gives more friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (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 carpet 8 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
25. 25.🛞 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 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a box pushed on carpet (d) a smooth steel slide
28. 28.True or false: a box pushed on carpet gives less friction. (a) True (b) False
29. 29.True or false: a smooth steel slide gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
33. 33.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
36. 36.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
37. 37.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a rough doormat (d) a wet tiled floor
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank

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