Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 573 · 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: oil on a squeaky hinge gives more friction. (a) True (b) False
2. 2.🛞 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 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
3. 3.True or false: sand on a slippery path gives less friction. (a) True (b) False
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
5. 5.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) powder on a carrom board
7. 7.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
8. 8.True or false: a tyre with deep treads gives less friction. (a) True (b) False
9. 9.🛞 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 wooden plank 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
10. 10.True or false: powder on a carrom board gives less friction. (a) False (b) True
11. 11.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
12. 12.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) skating on ice (d) sand on a slippery path
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
18. 18.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
22. 22.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.🛞 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 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) chalk on a gym bar (d) a smooth steel slide
27. 27.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
29. 29.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
31. 31.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🛞 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 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a grippy rubber sole
36. 36.True or false: a box pushed on carpet gives less friction. (a) False (b) True
37. 37.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
39. 39.True or false: a rough doormat gives less friction. (a) False (b) True
40. 40.True or false: sand on a slippery path gives more friction. (a) True (b) False

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