Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 586 · 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 carpet 7 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a smooth steel slide (d) a wet tiled floor
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.True or false: a grippy rubber sole gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
8. 8.True or false: sand on a slippery path gives less friction. (a) True (b) False
9. 9.True or false: powder on a carrom board gives more friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
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: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
13. 13.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
15. 15.True or false: powder on a carrom board gives less friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
17. 17.🔍 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
18. 18.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a rough doormat (d) a box pushed on carpet
21. 21.True or false: chalk on a gym bar gives less friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a rough doormat
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
29. 29.🛞 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, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) powder on a carrom board
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) powder on a carrom board (d) a wheel on ball bearings
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wheel on ball bearings (d) sand on a slippery path
39. 39.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) powder on a carrom board (d) a grippy rubber sole
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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