Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 166 · 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 glass sheet 2 N, a wooden plank 4 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
4. 4.True or false: sand on a slippery path gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.🛞 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 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a smooth steel slide (d) oil on a squeaky hinge
12. 12.True or false: sand on a slippery path gives more friction. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
16. 16.True or false: a box pushed on carpet gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a grippy rubber sole (d) a tyre with deep treads
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a rough doormat (d) a box pushed on carpet
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 12 N, a carpet 15 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a smooth steel slide (d) powder on a carrom board
25. 25.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
26. 26.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
27. 27.🛞 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 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
28. 28.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a grippy rubber sole (d) a smooth steel slide
31. 31.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
34. 34.True or false: a smooth steel slide gives more friction. (a) True (b) False
35. 35.True or false: a wet tiled floor gives more friction. (a) False (b) True
36. 36.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wheel on ball bearings (d) a tyre with deep treads
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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