Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 540 · 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.True or false: powder on a carrom board gives more friction. (a) False (b) True
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 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
3. 3.True or false: a grippy rubber sole gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a wet tiled floor
6. 6.True or false: sand on a slippery path gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
10. 10.True or false: powder on a carrom board gives less friction. (a) False (b) True
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🛞 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 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
18. 18.True or false: a rough doormat gives more friction. (a) False (b) True
19. 19.True or false: chalk on a gym bar gives less friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) skating on ice (d) a wheel on ball bearings
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
23. 23.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
24. 24.🛞 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 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a rough doormat (d) a box pushed on carpet
27. 27.🛞 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, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
28. 28.🛞 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, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
33. 33.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
34. 34.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
36. 36.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
38. 38.True or false: a wet tiled floor gives more friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a grippy rubber sole (d) a wet tiled floor
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?

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