Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 878 · 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.True or false: powder on a carrom board gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
5. 5.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) powder on a carrom board
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 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 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
27. 27.🛞 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 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
28. 28.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
29. 29.True or false: a rough doormat gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) skating on ice
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.🛞 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 carpet 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 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 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a smooth steel slide gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
38. 38.🛞 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, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wheel on ball bearings (d) powder on a carrom board

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