Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 366 · 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.True or false: a rough doormat gives less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wheel on ball bearings
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
7. 7.True or false: a smooth steel slide gives more friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
10. 10.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
13. 13.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
14. 14.True or false: a tyre with deep treads gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
20. 20.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.True or false: a rough doormat gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
27. 27.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a smooth steel slide (d) a rough doormat
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
33. 33.🛞 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 8 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) sand on a slippery path (d) a wet tiled floor
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) sand on a slippery path (c) a tyre with deep treads (d) a box pushed on carpet
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 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
39. 39.True or false: a wet tiled floor gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 13 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?

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