Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 588 · 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.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a smooth steel slide (d) a box pushed on carpet
2. 2.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a rough doormat (d) oil on a squeaky hinge
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.True or false: a grippy rubber sole gives more friction. (a) True (b) False
8. 8.🛞 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 least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
11. 11.True or false: chalk on a gym bar gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
14. 14.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
15. 15.True or false: a rough doormat gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
17. 17.🛞 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 carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
18. 18.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) sand on a slippery path
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a wheel on ball bearings (d) a tyre with deep treads
25. 25.🛞 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 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
26. 26.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
29. 29.🛞 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 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
38. 38.True or false: sand on a slippery path gives less friction. (a) True (b) False
39. 39.True or false: a grippy rubber sole gives less friction. (a) True (b) False
40. 40.True or false: a smooth steel slide gives less friction. (a) True (b) False

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