Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 581 · 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.True or false: a rough doormat gives less friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
3. 3.True or false: a wet tiled floor gives more friction. (a) True (b) False
4. 4.🛞 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, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a smooth steel slide (d) a tyre with deep treads
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.True or false: a grippy rubber sole gives less friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 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) ice (d) a wooden plank
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
25. 25.🛞 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 wooden plank 3 N, sandpaper 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
28. 28.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) powder on a carrom board (d) a smooth steel slide
30. 30.True or false: powder on a carrom board gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
35. 35.True or false: chalk on a gym bar gives less friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem

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