Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 550 · 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) more friction (b) less friction
2. 2.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
3. 3.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
6. 6.True or false: a grippy rubber sole gives less friction. (a) False (b) True
7. 7.True or false: powder on a carrom board gives less friction. (a) False (b) True
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
11. 11.🛞 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 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
15. 15.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
16. 16.True or false: a box pushed on carpet gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a grippy rubber sole (d) a rough doormat
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 11 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a wheel on ball bearings (d) skating on ice
21. 21.True or false: chalk on a gym bar gives more friction. (a) True (b) False
22. 22.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
25. 25.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
26. 26.True or false: a wet tiled floor gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
29. 29.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
30. 30.🛞 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, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.🛞 More or less friction: a tyre with deep treads? (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 carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a box pushed on carpet (d) powder on a carrom board
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wet tiled floor (d) powder on a carrom board
37. 37.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a grippy rubber sole gives more friction. (a) False (b) True

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