Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 478 · 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) oil on a squeaky hinge (b) sand on a slippery path (c) a smooth steel slide (d) skating on ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
7. 7.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
8. 8.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a wet tiled floor (d) a tyre with deep treads
12. 12.🛞 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 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
13. 13.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
14. 14.True or false: a box pushed on carpet gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
17. 17.True or false: a tyre with deep treads gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 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 8 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a smooth steel slide gives less friction. (a) True (b) False
27. 27.True or false: a rough doormat gives less friction. (a) False (b) True
28. 28.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.🛞 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 3 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a smooth steel slide (d) a wet tiled floor
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
35. 35.🛞 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 11 N, a carpet 15 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
36. 36.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) chalk on a gym bar
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a rough doormat (d) a grippy rubber sole
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough

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