Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 657 · 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: powder on a carrom board? (a) less friction (b) more friction
2. 2.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
4. 4.True or false: a tyre with deep treads gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
8. 8.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
9. 9.🛞 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 3 N, sandpaper 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: a rough doormat gives less friction. (a) True (b) False
13. 13.🛞 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 12 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
19. 19.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
20. 20.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
21. 21.🛞 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 carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
24. 24.🛞 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 wooden plank 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a smooth steel slide (d) a box pushed on carpet
26. 26.🛞 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, ice 2 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a grippy rubber sole (d) a wheel on ball bearings
32. 32.🛞 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 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
33. 33.True or false: a wet tiled floor gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) skating on ice
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a wet tiled floor (d) sand on a slippery path
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.True or false: a grippy rubber sole gives more friction. (a) True (b) False
39. 39.True or false: a rough doormat gives more 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 3 N, a carpet 6 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?

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