Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 631 · 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.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
2. 2.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 13 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a grippy rubber sole (d) a box pushed on carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
12. 12.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a grippy rubber sole (d) a wheel on ball bearings
13. 13.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) powder on a carrom board (d) skating on ice
14. 14.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
15. 15.True or false: a grippy rubber sole gives less friction. (a) True (b) False
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
17. 17.True or false: a smooth steel slide gives more friction. (a) False (b) True
18. 18.True or false: chalk on a gym bar gives less friction. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) chalk on a gym bar (d) a smooth steel slide
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
21. 21.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
22. 22.True or false: a tyre with deep treads gives less friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) powder on a carrom board (d) chalk on a gym bar
24. 24.True or false: powder on a carrom board gives less friction. (a) True (b) False
25. 25.True or false: a smooth steel slide gives less friction. (a) True (b) False
26. 26.True or false: a wet tiled floor gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) chalk on a gym bar (d) a grippy rubber sole
28. 28.True or false: a wet tiled floor gives less friction. (a) True (b) False
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
32. 32.True or false: a tyre with deep treads gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) sand on a slippery path (d) a grippy rubber sole
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.True or false: a rough doormat gives less friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet

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