Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 52 · 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 rough doormat? (a) less friction (b) more friction
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
5. 5.True or false: chalk on a gym bar gives less friction. (a) True (b) False
6. 6.True or false: powder on a carrom board gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a rough doormat (d) oil on a squeaky hinge
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
13. 13.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a box pushed on carpet (d) a smooth steel slide
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
16. 16.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.True or false: a wet tiled floor gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
21. 21.True or false: a rough doormat gives more friction. (a) False (b) True
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a smooth steel slide (d) a wet tiled floor
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
28. 28.True or false: chalk on a gym bar gives more friction. (a) True (b) False
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
30. 30.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
32. 32.True or false: a tyre with deep treads gives less friction. (a) True (b) False
33. 33.True or false: sand on a slippery path gives more friction. (a) False (b) True
34. 34.True or false: a rough doormat gives less friction. (a) True (b) False
35. 35.🔍 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 wet tiled floor
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.🛞 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 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
38. 38.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
39. 39.True or false: powder on a carrom board gives more friction. (a) False (b) True
40. 40.True or false: a grippy rubber sole gives more friction. (a) True (b) False

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