Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 786 · 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: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a smooth steel slide (d) a tyre with deep treads
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) oil on a squeaky hinge (d) a wheel on ball bearings
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) skating on ice (d) sand on a slippery path
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a box pushed on carpet (d) powder on a carrom board
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
19. 19.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 14 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
21. 21.True or false: a tyre with deep treads gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: a box pushed on carpet? (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 glass sheet 7 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
24. 24.True or false: skating on ice gives more friction. (a) False (b) True
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
26. 26.True or false: a tyre with deep treads gives more friction. (a) False (b) True
27. 27.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) chalk on a gym bar (d) a wet tiled floor
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
32. 32.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
33. 33.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
34. 34.True or false: sand on a slippery path gives less friction. (a) False (b) True
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
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 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
38. 38.🛞 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 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
40. 40.🛞 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, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice

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