Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 728 · 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 wheel on ball bearings gives less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a smooth steel slide (d) a rough doormat
3. 3.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
4. 4.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
5. 5.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a box pushed on carpet (d) a wet tiled floor
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
13. 13.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
15. 15.True or false: a grippy rubber sole gives less friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
18. 18.🛞 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 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
19. 19.True or false: chalk on a gym bar gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
22. 22.🛞 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 11 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 14 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
25. 25.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
26. 26.🛞 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 5 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 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 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a wheel on ball bearings
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 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 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank

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