Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 640 · 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 8 N, sandpaper 11 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
3. 3.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
7. 7.True or false: skating on ice gives more friction. (a) True (b) False
8. 8.🛞 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 11 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
9. 9.🛞 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 10 N, a carpet 12 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
10. 10.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
11. 11.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
12. 12.🛞 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, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) chalk on a gym bar (d) a box pushed on carpet
14. 14.True or false: chalk on a gym bar gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) powder on a carrom board
17. 17.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
18. 18.True or false: a box pushed on carpet gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
21. 21.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
22. 22.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
27. 27.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a wheel on ball bearings
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
29. 29.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
31. 31.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
32. 32.True or false: sand on a slippery path gives more friction. (a) True (b) False
33. 33.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.True or false: powder on a carrom board gives less friction. (a) False (b) True
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 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a grippy rubber sole (d) chalk on a gym bar

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