Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 798 · 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.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
2. 2.True or false: a smooth steel slide gives more friction. (a) True (b) False
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
4. 4.🛞 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 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
5. 5.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
6. 6.True or false: powder on a carrom board gives less friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a box pushed on carpet (d) a grippy rubber sole
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
9. 9.True or false: chalk on a gym bar gives less friction. (a) False (b) True
10. 10.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a rough doormat (d) a wet tiled floor
12. 12.True or false: a grippy rubber sole gives more friction. (a) False (b) True
13. 13.True or false: a wet tiled floor gives less friction. (a) True (b) False
14. 14.🛞 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 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) skating on ice (d) a tyre with deep treads
16. 16.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) chalk on a gym bar (d) a box pushed on carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
20. 20.True or false: skating on ice gives more friction. (a) False (b) True
21. 21.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
23. 23.True or false: a box pushed on carpet gives less friction. (a) True (b) False
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a box pushed on carpet (d) powder on a carrom board
28. 28.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.True or false: a smooth steel slide gives less friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wet tiled floor (d) chalk on a gym bar
36. 36.🛞 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 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a smooth steel slide (d) sand on a slippery path
39. 39.True or false: chalk on a gym bar gives more friction. (a) False (b) True
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True

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