Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 157 · 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.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) powder on a carrom board (d) skating on ice
2. 2.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) sand on a slippery path (d) a box pushed on carpet
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
10. 10.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) powder on a carrom board (d) skating on ice
12. 12.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
13. 13.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a rough doormat (d) a smooth steel slide
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
17. 17.True or false: a rough doormat gives less friction. (a) True (b) False
18. 18.🛞 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 carpet 9 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a grippy rubber sole (d) chalk on a gym bar
21. 21.🛞 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 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
22. 22.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
23. 23.True or false: sand on a slippery path gives more friction. (a) True (b) False
24. 24.True or false: skating on ice gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
26. 26.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 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 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
30. 30.🛞 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 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
33. 33.🛞 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 least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
34. 34.🛞 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 carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a grippy rubber sole (d) chalk on a gym bar
37. 37.True or false: a box pushed on carpet gives less friction. (a) False (b) True
38. 38.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem

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