Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 723 · 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: a tyre with deep treads? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a box pushed on carpet (d) a smooth steel slide
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
8. 8.True or false: a smooth steel slide gives more friction. (a) False (b) True
9. 9.True or false: powder on a carrom board gives more friction. (a) False (b) True
10. 10.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a smooth steel slide (d) oil on a squeaky hinge
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
19. 19.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
20. 20.True or false: skating on ice gives more friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wet tiled floor (d) a box pushed on carpet
22. 22.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) skating on ice
23. 23.True or false: a smooth steel slide gives less friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) powder on a carrom board (d) a box pushed on carpet
25. 25.🛞 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 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a grippy rubber sole (d) oil on a squeaky hinge
28. 28.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
30. 30.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
34. 34.🛞 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 carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 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, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a tyre with deep treads gives more friction. (a) True (b) False
38. 38.True or false: a rough doormat gives more friction. (a) False (b) True
39. 39.True or false: powder on a carrom board gives less friction. (a) False (b) True
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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