Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 240 · 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: dragging a heavy box? (a) helpful (b) a problem
2. 2.True or false: powder on a carrom board gives less friction. (a) False (b) True
3. 3.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.🛞 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 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.True or false: a rough doormat gives less friction. (a) True (b) False
9. 9.True or false: skating on ice gives less friction. (a) True (b) False
10. 10.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
11. 11.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
13. 13.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
15. 15.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a wet tiled floor (d) a smooth steel slide
16. 16.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
17. 17.True or false: a box pushed on carpet gives less friction. (a) False (b) True
18. 18.True or false: a box pushed on carpet gives more friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
20. 20.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
23. 23.True or false: sand on a slippery path gives more friction. (a) True (b) False
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.True or false: a tyre with deep treads gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
28. 28.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) a grippy rubber sole
29. 29.🛞 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 carpet 3 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a grippy rubber sole (d) a wet tiled floor
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.True or false: powder on a carrom board gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) skating on ice
36. 36.🛞 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 least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.True or false: chalk on a gym bar gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
40. 40.True or false: a rough doormat gives more friction. (a) False (b) True

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