Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 808 · 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.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
3. 3.🛞 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 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.True or false: a box pushed on carpet gives more friction. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a smooth steel slide (d) a tyre with deep treads
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 2 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: a wooden plank 4 N, a carpet 7 N, sandpaper 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice
12. 12.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a rough doormat (d) a smooth steel slide
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
15. 15.True or false: a wet tiled floor gives more friction. (a) False (b) True
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
18. 18.True or false: a tyre with deep treads gives less friction. (a) False (b) True
19. 19.🛞 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 10 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
23. 23.🛞 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 wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) a wheel on ball bearings
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) oil on a squeaky hinge (d) powder on a carrom board
26. 26.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
28. 28.True or false: a rough doormat gives less friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a box pushed on carpet
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: chalk on a gym bar gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
39. 39.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
40. 40.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction

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