Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 898 · 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: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
2. 2.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
5. 5.🛞 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, a carpet 11 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) skating on ice
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 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 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a wheel on ball bearings (d) a smooth steel slide
13. 13.True or false: a rough doormat gives less friction. (a) True (b) False
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 12 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
25. 25.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
31. 31.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a wet tiled floor
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
39. 39.🛞 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 carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 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 9 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper

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