Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 692 · 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: a grippy rubber sole? (a) less friction (b) more friction
2. 2.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
3. 3.🛞 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 10 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.True or false: a wet tiled floor gives less friction. (a) True (b) False
6. 6.🛞 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 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
7. 7.True or false: a tyre with deep treads gives more friction. (a) False (b) True
8. 8.True or false: skating on ice gives less friction. (a) True (b) False
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a tyre with deep treads (d) a smooth steel slide
11. 11.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a tyre with deep treads (d) a grippy rubber sole
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.True or false: skating on ice gives more friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a wheel on ball bearings (d) a rough doormat
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a rough doormat
19. 19.🛞 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 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
22. 22.🛞 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 8 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a wheel on ball bearings (d) a wet tiled floor
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.🛞 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 9 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
31. 31.True or false: sand on a slippery path gives more friction. (a) False (b) True
32. 32.🛞 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 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
34. 34.🛞 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 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
36. 36.🔍 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
37. 37.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) skating on ice (d) a rough doormat
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
40. 40.🛞 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 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank

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