Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 220 · 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 surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
2. 2.True or false: chalk on a gym bar gives less friction. (a) True (b) False
3. 3.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: sand on a slippery path? (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 wooden plank 8 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
8. 8.True or false: a tyre with deep treads gives less friction. (a) False (b) True
9. 9.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) chalk on a gym bar (d) sand on a slippery path
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) sand on a slippery path
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a rough doormat (d) a box pushed on carpet
16. 16.True or false: chalk on a gym bar gives more friction. (a) False (b) True
17. 17.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) a rough doormat
20. 20.🛞 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 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 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 9 N, a carpet 12 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) oil on a squeaky hinge
23. 23.True or false: a wet tiled floor gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 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 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
31. 31.True or false: a rough doormat gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
33. 33.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a grippy rubber sole (d) a wet tiled floor
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
36. 36.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
37. 37.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
38. 38.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
39. 39.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
40. 40.🛞 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 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice

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