Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 76 · 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: a tyre with deep treads? (a) less friction (b) more friction
2. 2.True or false: powder on a carrom board gives less friction. (a) False (b) True
3. 3.True or false: a tyre with deep treads gives less friction. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 15 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
6. 6.True or false: a box pushed on carpet gives more friction. (a) False (b) True
7. 7.True or false: a rough doormat gives more friction. (a) False (b) True
8. 8.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
9. 9.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
10. 10.True or false: sand on a slippery path gives more friction. (a) True (b) False
11. 11.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.True or false: a tyre with deep treads gives more friction. (a) False (b) True
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
16. 16.True or false: skating on ice gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a box pushed on carpet
19. 19.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a rough doormat (d) skating on ice
23. 23.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) powder on a carrom board (d) a wet tiled floor
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a rough doormat (d) a grippy rubber sole
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
30. 30.True or false: a rough doormat gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
34. 34.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a smooth steel slide
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a grippy rubber sole (d) powder on a carrom board
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem

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