Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 513 · 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: sandpaper 10 N, ice 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.True or false: a wet tiled floor gives less friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
8. 8.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
9. 9.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
11. 11.True or false: sand on a slippery path gives more friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a rough doormat (d) a box pushed on carpet
13. 13.🛞 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 carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
14. 14.True or false: powder on a carrom board gives more friction. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
18. 18.True or false: a tyre with deep treads gives more friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a box pushed on carpet (d) chalk on a gym bar
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
23. 23.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) skating on ice (d) oil on a squeaky hinge
27. 27.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
32. 32.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a wheel on ball bearings (d) a wet tiled floor
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a grippy rubber sole
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
36. 36.🛞 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 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
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 10 N, ice 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice

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