Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 584 · 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 wooden plank 4 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.True or false: a box pushed on carpet gives more friction. (a) True (b) False
8. 8.True or false: sand on a slippery path gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
10. 10.🛞 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 10 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a tyre with deep treads (d) chalk on a gym bar
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.🔍 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) skating on ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.True or false: powder on a carrom board gives more friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) sand on a slippery path (d) a grippy rubber sole
21. 21.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
23. 23.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) skating on ice (d) oil on a squeaky hinge
27. 27.True or false: a box pushed on carpet gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (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 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) oil on a squeaky hinge
32. 32.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a tyre with deep treads (d) a wheel on ball bearings
33. 33.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
34. 34.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
35. 35.🛞 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 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
37. 37.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 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 14 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper

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