Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 439 · 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: shoe soles wearing out? (a) helpful (b) a problem
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
6. 6.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) oil on a squeaky hinge (d) a wet tiled floor
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a smooth steel slide (d) a box pushed on carpet
9. 9.True or false: skating on ice gives less friction. (a) True (b) False
10. 10.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) skating on ice (d) a tyre with deep treads
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
14. 14.True or false: a smooth steel slide gives less friction. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a grippy rubber sole (d) a box pushed on carpet
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a smooth steel slide (d) a rough doormat
18. 18.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
19. 19.🛞 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 7 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
21. 21.True or false: a wet tiled floor gives more friction. (a) False (b) True
22. 22.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
29. 29.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
30. 30.True or false: sand on a slippery path gives less friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
34. 34.True or false: a grippy rubber sole gives more friction. (a) False (b) True
35. 35.True or false: skating on ice gives more friction. (a) False (b) True
36. 36.True or false: a box pushed on carpet gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
38. 38.🛞 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 8 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice

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