Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 467 · 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 wet tiled floor gives less friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.🛞 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 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.True or false: skating on ice gives less friction. (a) False (b) True
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.True or false: sand on a slippery path gives more friction. (a) False (b) True
9. 9.True or false: a rough doormat gives less friction. (a) False (b) True
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
12. 12.🛞 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 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) sand on a slippery path (d) chalk on a gym bar
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a smooth steel slide (d) skating on ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
22. 22.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
24. 24.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.True or false: a wet tiled floor gives more friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a rough doormat
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.True or false: a box pushed on carpet gives more friction. (a) True (b) False
33. 33.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
34. 34.True or false: a smooth steel slide gives less friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) sand on a slippery path
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
40. 40.🛞 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 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper

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