Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 288 · 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 4 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 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. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.True or false: chalk on a gym bar gives less friction. (a) True (b) False
6. 6.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.True or false: sand on a slippery path gives more friction. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
12. 12.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a smooth steel slide (d) chalk on a gym bar
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
15. 15.🛞 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 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
17. 17.🛞 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 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a wheel on ball bearings (d) sand on a slippery path
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a rough doormat (d) powder on a carrom board
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
25. 25.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
29. 29.🛞 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 2 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
30. 30.True or false: chalk on a gym bar gives more friction. (a) False (b) True
31. 31.True or false: skating on ice gives less friction. (a) False (b) True
32. 32.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
35. 35.True or false: a rough doormat gives more friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
39. 39.True or false: powder on a carrom board gives less friction. (a) False (b) True
40. 40.🛞 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 5 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper

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