Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 891 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
5. 5.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
7. 7.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a box pushed on carpet (d) skating on ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a box pushed on carpet (d) sand on a slippery path
10. 10.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.True or false: powder on a carrom board gives more friction. (a) False (b) True
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.True or false: a tyre with deep treads gives more friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a tyre with deep treads (d) a wet tiled floor
24. 24.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
25. 25.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
27. 27.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a box pushed on carpet (d) powder on a carrom board
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) powder on a carrom board (d) chalk on a gym bar
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.True or false: a tyre with deep treads gives less friction. (a) True (b) False
32. 32.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) powder on a carrom board (d) a rough doormat
34. 34.True or false: sand on a slippery path gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: a wet tiled floor gives more friction. (a) False (b) True
37. 37.True or false: a rough doormat gives less friction. (a) False (b) True
38. 38.🛞 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, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
39. 39.True or false: chalk on a gym bar gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice

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