Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 882 · 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.🛞 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 wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) powder on a carrom board (d) a wheel on ball bearings
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
4. 4.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
5. 5.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
6. 6.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) oil on a squeaky hinge (d) a box pushed on carpet
9. 9.True or false: chalk on a gym bar gives less friction. (a) False (b) True
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: a tyre with deep treads gives more friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
14. 14.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
16. 16.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
18. 18.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
19. 19.True or false: a smooth steel slide gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) sand on a slippery path (d) a smooth steel slide
22. 22.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
25. 25.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
27. 27.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
28. 28.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 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 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) oil on a squeaky hinge (d) powder on a carrom board
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
34. 34.True or false: sand on a slippery path gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper 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 11 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.True or false: oil on a squeaky hinge 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: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet

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