Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 866 · 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.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
2. 2.True or false: a box pushed on carpet gives more friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 8 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
16. 16.True or false: a grippy rubber sole gives more friction. (a) True (b) False
17. 17.🛞 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 wooden plank 10 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.True or false: chalk on a gym bar gives more friction. (a) True (b) False
22. 22.🛞 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) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
23. 23.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
29. 29.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
30. 30.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.🛞 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 7 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) a wheel on ball bearings
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
39. 39.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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