Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 261 · 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 7 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) oil on a squeaky hinge
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
5. 5.True or false: a tyre with deep treads gives less friction. (a) False (b) True
6. 6.True or false: a rough doormat gives less friction. (a) True (b) False
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
8. 8.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
12. 12.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
14. 14.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
15. 15.True or false: a grippy rubber sole gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) skating on ice (d) a wet tiled floor
17. 17.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a smooth steel slide (d) skating on ice
22. 22.🛞 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 most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
23. 23.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
25. 25.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
26. 26.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wet tiled floor (d) a box pushed on carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) powder on a carrom board (d) a smooth steel slide
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
32. 32.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) skating on ice (d) a rough doormat
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 8 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
36. 36.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem

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