Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 441 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
3. 3.True or false: powder on a carrom board gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
5. 5.🛞 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 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a grippy rubber sole (d) sand on a slippery path
7. 7.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
13. 13.True or false: a smooth steel slide gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
18. 18.True or false: a wet tiled floor gives less friction. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a smooth steel slide
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (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 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) a grippy rubber sole
28. 28.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
29. 29.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
31. 31.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
32. 32.🛞 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 carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
34. 34.🛞 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 6 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: sand on a slippery path gives more friction. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem

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