Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 54 · 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.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
3. 3.True or false: sand on a slippery path gives more friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
8. 8.True or false: powder on a carrom board gives more friction. (a) False (b) True
9. 9.🛞 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, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: a rough doormat gives more friction. (a) True (b) False
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a tyre with deep treads (d) a wheel on ball bearings
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.True or false: a box pushed on carpet gives less friction. (a) False (b) True
16. 16.True or false: a wet tiled floor gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) sand on a slippery path (d) chalk on a gym bar
18. 18.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
19. 19.True or false: a tyre with deep treads gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: a rough doormat? (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 7 N, a wooden plank 10 N, a carpet 12 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
22. 22.True or false: a wet tiled floor gives less friction. (a) True (b) False
23. 23.True or false: a tyre with deep treads gives less friction. (a) False (b) True
24. 24.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
25. 25.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) powder on a carrom board
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a tyre with deep treads
33. 33.🛞 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. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
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 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
35. 35.🛞 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 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
37. 37.True or false: a rough doormat gives less friction. (a) True (b) False
38. 38.True or false: a grippy rubber sole gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet

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