Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 874 · 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 wooden plank 3 N, a carpet 4 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
2. 2.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
4. 4.True or false: sand on a slippery path gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.🛞 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, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🛞 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, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.True or false: a smooth steel slide gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a wet tiled floor (d) sand on a slippery path
17. 17.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
20. 20.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
22. 22.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) skating on ice (d) oil on a squeaky hinge
24. 24.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
25. 25.True or false: a rough doormat gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
29. 29.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) a box pushed on carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
35. 35.🛞 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 7 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
36. 36.🛞 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, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) chalk on a gym bar
40. 40.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a smooth steel slide (d) a grippy rubber sole

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