Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 553 · 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 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wet tiled floor
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a tyre with deep treads (d) a wet tiled floor
11. 11.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🛞 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 5 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wet tiled floor (d) chalk on a gym bar
16. 16.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
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 wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
24. 24.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
25. 25.True or false: a box pushed on carpet gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.True or false: powder on a carrom board gives more friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) powder on a carrom board (d) skating on ice
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wheel on ball bearings (d) a tyre with deep treads
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a smooth steel slide
32. 32.🛞 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 carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.True or false: a tyre with deep treads gives less friction. (a) False (b) True
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
37. 37.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a rough doormat
40. 40.True or false: a wheel on ball bearings gives more friction. (a) True (b) False

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