Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 952 · 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 5 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
3. 3.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) sand on a slippery path (d) a wet tiled floor
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
8. 8.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
11. 11.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.True or false: a wet tiled floor gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) skating on ice (d) a smooth steel slide
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 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, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a tyre with deep treads (d) oil on a squeaky hinge
23. 23.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a tyre with deep treads (d) sand on a slippery path
25. 25.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 16 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
28. 28.🛞 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 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
31. 31.True or false: a wet tiled floor 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: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
36. 36.True or false: a grippy rubber sole 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: a glass sheet 6 N, a wooden plank 8 N, sandpaper 12 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) skating on ice (d) oil on a squeaky hinge
39. 39.🛞 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, a carpet 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide

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