Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 164 · 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) a grippy rubber sole (b) oil on a squeaky hinge (c) powder on a carrom board (d) a wheel on ball bearings
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 13 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
6. 6.🛞 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, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.True or false: powder on a carrom board gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a smooth steel slide (d) skating on ice
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a box pushed on carpet (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
14. 14.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
17. 17.True or false: a rough doormat gives less friction. (a) False (b) True
18. 18.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
20. 20.True or false: chalk on a gym bar gives less friction. (a) True (b) False
21. 21.🛞 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 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
22. 22.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) chalk on a gym bar (d) sand on a slippery path
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
25. 25.🛞 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 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
26. 26.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) a grippy rubber sole
27. 27.🛞 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 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 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, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
29. 29.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
30. 30.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
31. 31.True or false: a grippy rubber sole 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 6 N, a wooden plank 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
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 2 N, a carpet 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.True or false: powder on a carrom board gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
39. 39.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
40. 40.True or false: a smooth steel slide gives more friction. (a) True (b) False

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