Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 981 · 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) sand on a slippery path (b) a tyre with deep treads (c) a box pushed on carpet (d) skating on ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
6. 6.True or false: sand on a slippery path gives less friction. (a) True (b) False
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 wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
8. 8.🛞 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 wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
16. 16.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
17. 17.🛞 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 wooden plank 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
19. 19.True or false: powder on a carrom board gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: skating on ice gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) chalk on a gym bar
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
24. 24.True or false: a tyre with deep treads gives more friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
26. 26.True or false: a tyre with deep treads gives less friction. (a) True (b) False
27. 27.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a rough doormat (d) sand on a slippery path
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.True or false: powder on a carrom board gives less friction. (a) True (b) False
32. 32.True or false: chalk on a gym bar gives less friction. (a) True (b) False
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a smooth steel slide (d) skating on ice
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 6 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: a wet tiled floor gives more friction. (a) False (b) True
37. 37.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
38. 38.🛞 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, sandpaper 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
39. 39.🛞 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 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
40. 40.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards

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