Engineering Worksheet: Friction

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

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