Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 418 · 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 wooden plank 8 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wet tiled floor (d) sand on a slippery path
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
7. 7.True or false: powder on a carrom board gives more friction. (a) False (b) True
8. 8.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a smooth steel slide (d) oil on a squeaky hinge
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
16. 16.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
18. 18.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
19. 19.True or false: sand on a slippery path gives more friction. (a) True (b) False
20. 20.True or false: chalk on a gym bar gives less friction. (a) True (b) False
21. 21.True or false: a tyre with deep treads gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a wet tiled floor gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
28. 28.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
29. 29.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) sand on a slippery path (d) chalk on a gym bar
31. 31.🔍 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 tyre with deep treads
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a grippy rubber sole gives more friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) a wheel on ball bearings
40. 40.True or false: a smooth steel slide gives less friction. (a) False (b) True

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