Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 475 · 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 grippy rubber sole (b) a box pushed on carpet (c) a wet tiled floor (d) sand on a slippery path
2. 2.🛞 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 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: skating on ice gives more friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wet tiled floor (d) sand on a slippery path
6. 6.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
10. 10.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.True or false: a wet tiled floor gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.True or false: a rough doormat gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
19. 19.🛞 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 12 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
24. 24.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) powder on a carrom board (d) skating on ice
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) oil on a squeaky hinge
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) powder on a carrom board (d) a box pushed on carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
32. 32.True or false: chalk on a gym bar gives more friction. (a) True (b) False
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
34. 34.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
35. 35.🛞 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 12 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
38. 38.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
39. 39.🛞 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 least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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