Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 961 · 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: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
3. 3.True or false: chalk on a gym bar gives less friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a grippy rubber sole (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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) oil on a squeaky hinge
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
15. 15.True or false: a grippy rubber sole gives more friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
21. 21.True or false: a box pushed on carpet gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a smooth steel slide (d) a grippy rubber sole
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a grippy rubber sole
26. 26.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
28. 28.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
29. 29.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
30. 30.True or false: powder on a carrom board gives less friction. (a) False (b) True
31. 31.True or false: skating on ice gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.🛞 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 wooden plank 10 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice

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