Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 407 · 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 less friction. (a) False (b) True
2. 2.True or false: a tyre with deep treads gives less friction. (a) True (b) False
3. 3.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
4. 4.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
5. 5.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
12. 12.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
15. 15.True or false: skating on ice gives less friction. (a) False (b) True
16. 16.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
17. 17.🛞 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, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
21. 21.True or false: skating on ice gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) skating on ice (d) sand on a slippery path
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
26. 26.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
27. 27.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
31. 31.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) a box pushed on carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
34. 34.True or false: a smooth steel slide 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 13 N, ice 4 N, a glass sheet 8 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
36. 36.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
37. 37.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a wet tiled floor (d) skating on ice
38. 38.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.True or false: a wet tiled floor gives more friction. (a) False (b) True

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