Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 737 · 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.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) oil on a squeaky hinge
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) chalk on a gym bar
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
11. 11.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) a box pushed on carpet
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
19. 19.True or false: a tyre with deep treads gives less friction. (a) False (b) True
20. 20.True or false: a smooth steel slide gives less friction. (a) True (b) False
21. 21.True or false: skating on ice gives more friction. (a) False (b) True
22. 22.True or false: a rough doormat gives less friction. (a) True (b) False
23. 23.🛞 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 5 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
25. 25.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
26. 26.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
27. 27.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
28. 28.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
32. 32.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
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 7 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
36. 36.True or false: sand on a slippery path gives less friction. (a) False (b) True
37. 37.🛞 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 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 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 wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank

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