Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 211 · 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) sandpaper (c) ice (d) polished marble
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
4. 4.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
5. 5.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (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 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
10. 10.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
11. 11.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
12. 12.True or false: a tyre with deep treads gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
14. 14.🛞 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, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
15. 15.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
20. 20.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
21. 21.🛞 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 9 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a wheel on ball bearings (d) a rough doormat
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 8 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 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 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a wet tiled floor (d) a box pushed on carpet
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor
33. 33.🛞 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 6 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) skating on ice (d) oil on a squeaky hinge
36. 36.True or false: a grippy rubber sole gives less friction. (a) False (b) True
37. 37.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
38. 38.True or false: a grippy rubber sole gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
40. 40.True or false: a tyre with deep treads gives less friction. (a) False (b) True

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