Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 384 · 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.True or false: sand on a slippery path gives less friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
3. 3.🛞 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 wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
9. 9.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) powder on a carrom board
11. 11.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) sand on a slippery path (d) a smooth steel slide
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.True or false: a rough doormat gives less friction. (a) False (b) True
16. 16.🔍 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
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a wheel on ball bearings (d) a grippy rubber sole
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
20. 20.True or false: a wet tiled floor gives less friction. (a) False (b) True
21. 21.🛞 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 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
23. 23.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
28. 28.🛞 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 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
30. 30.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
33. 33.True or false: a smooth steel slide gives more friction. (a) False (b) True
34. 34.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
35. 35.True or false: a grippy rubber sole gives more friction. (a) False (b) True
36. 36.🛞 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 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
37. 37.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 3 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 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 8 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?

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