Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 427 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
2. 2.True or false: a rough doormat gives less friction. (a) True (b) False
3. 3.True or false: a tyre with deep treads gives more friction. (a) True (b) False
4. 4.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
8. 8.🛞 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 13 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) skating on ice (d) a grippy rubber sole
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a tyre with deep treads (d) chalk on a gym bar
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) chalk on a gym bar (d) a wet tiled floor
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
17. 17.True or false: a wet tiled floor gives less friction. (a) False (b) True
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
19. 19.🛞 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 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 15 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
23. 23.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) skating on ice (d) a tyre with deep treads
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
25. 25.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.True or false: a smooth steel slide gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
29. 29.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
30. 30.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a tyre with deep treads (d) a box pushed on carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 14 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
34. 34.True or false: a wet tiled floor gives more friction. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a wet tiled floor (d) powder on a carrom board
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
38. 38.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
40. 40.True or false: a grippy rubber sole gives less friction. (a) True (b) False

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