Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 308 · 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 8 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a box pushed on carpet (d) a tyre with deep treads
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a tyre with deep treads (d) chalk on a gym bar
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
6. 6.True or false: powder on a carrom board gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wet tiled floor (d) chalk on a gym bar
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
11. 11.🛞 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 carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
13. 13.True or false: a rough doormat gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
17. 17.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
18. 18.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
22. 22.True or false: a smooth steel slide gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) oil on a squeaky hinge
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 7 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
29. 29.True or false: a grippy rubber sole gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) powder on a carrom board (d) chalk on a gym bar
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
38. 38.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) powder on a carrom board (d) a grippy rubber sole

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