Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 722 · 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: a grippy rubber sole gives more friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
3. 3.True or false: chalk on a gym bar gives more friction. (a) True (b) False
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.True or false: a box pushed on carpet gives more friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
8. 8.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a wet tiled floor (d) oil on a squeaky hinge
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a rough doormat
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
15. 15.True or false: sand on a slippery path gives less friction. (a) False (b) True
16. 16.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
18. 18.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) powder on a carrom board (d) a wet tiled floor
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
22. 22.🛞 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 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) sand on a slippery path (d) a grippy rubber sole
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) chalk on a gym bar (d) a rough doormat
25. 25.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
28. 28.True or false: chalk on a gym bar gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
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 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
32. 32.True or false: powder on a carrom board gives more friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
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 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
39. 39.True or false: a tyre with deep treads gives less friction. (a) False (b) True
40. 40.True or false: a wheel on ball bearings gives less friction. (a) False (b) True

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