Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 531 · 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.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
2. 2.True or false: a rough doormat gives more friction. (a) False (b) True
3. 3.🛞 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 13 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
4. 4.True or false: a box pushed on carpet gives more friction. (a) False (b) True
5. 5.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
7. 7.True or false: a grippy rubber sole gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) oil on a squeaky hinge (d) a box pushed on carpet
11. 11.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
20. 20.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
21. 21.True or false: a smooth steel slide gives less friction. (a) False (b) True
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: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 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, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
26. 26.True or false: a wet tiled floor gives less friction. (a) True (b) False
27. 27.True or false: powder on a carrom board gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.True or false: sand on a slippery path gives more friction. (a) False (b) True
32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
33. 33.True or false: a rough doormat gives less friction. (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: dragging a heavy box? (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 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
36. 36.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
37. 37.True or false: a grippy rubber sole gives more friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a tyre with deep treads (d) a smooth steel slide
39. 39.True or false: a smooth steel slide gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet

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