Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 591 · 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: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a tyre with deep treads (d) sand on a slippery path
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 5 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
9. 9.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
14. 14.🛞 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 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
16. 16.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
17. 17.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
18. 18.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) powder on a carrom board (d) a smooth steel slide
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 9 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 carpet 9 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
36. 36.True or false: a wet tiled floor gives less friction. (a) True (b) False
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.True or false: a box pushed on carpet gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) powder on a carrom board (d) oil on a squeaky hinge

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