Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 853 · 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: skating on ice? (a) more friction (b) less friction
2. 2.True or false: a grippy rubber sole gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) oil on a squeaky hinge (d) a wheel on ball bearings
4. 4.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
9. 9.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
12. 12.🛞 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 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
14. 14.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
16. 16.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
17. 17.🛞 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, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
19. 19.True or false: a box pushed on carpet gives more friction. (a) False (b) True
20. 20.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
21. 21.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.True or false: a wet tiled floor gives less friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) skating on ice (d) chalk on a gym bar
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
28. 28.True or false: powder on a carrom board gives less friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 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 5 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a box pushed on carpet (d) a smooth steel slide
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.🛞 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, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
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 5 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
40. 40.🛞 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 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet

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