Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 678 · 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, a carpet 7 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
2. 2.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a wet tiled floor (d) a grippy rubber sole
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
5. 5.True or false: powder on a carrom board gives more friction. (a) False (b) True
6. 6.True or false: a box pushed on carpet gives more friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
8. 8.🛞 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 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) skating on ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
13. 13.🛞 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 least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
14. 14.True or false: a tyre with deep treads gives less friction. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) a wet tiled floor
16. 16.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wheel on ball bearings (d) a rough doormat
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a grippy rubber sole (d) oil on a squeaky hinge
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
21. 21.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
22. 22.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 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 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
35. 35.True or false: a grippy rubber sole gives less friction. (a) True (b) False
36. 36.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) sand on a slippery path
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
40. 40.🛞 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, ice 3 N. How many newtons more were needed on sandpaper than on ice?

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