Engineering Worksheet: Friction

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

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