Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 685 · 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: sand on a slippery path? (a) less friction (b) more friction
2. 2.🛞 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. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a wheel on ball bearings (d) skating on ice
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.True or false: a tyre with deep treads gives less friction. (a) True (b) False
7. 7.True or false: powder on a carrom board gives less friction. (a) False (b) True
8. 8.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a box pushed on carpet (d) a tyre with deep treads
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) powder on a carrom board
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a wet tiled floor (d) chalk on a gym bar
14. 14.True or false: a rough doormat gives less friction. (a) True (b) False
15. 15.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
17. 17.🛞 More or less friction: a wheel on ball bearings? (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 wooden plank 7 N, a carpet 9 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) oil on a squeaky hinge (d) a wet tiled floor
20. 20.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
22. 22.True or false: chalk on a gym bar gives more friction. (a) False (b) True
23. 23.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) sand on a slippery path (d) a wheel on ball bearings
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (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 carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) sand on a slippery path (d) a smooth steel slide
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?

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