Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 881 · 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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
2. 2.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
3. 3.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a smooth steel slide (d) oil on a squeaky hinge
5. 5.True or false: sand on a slippery path gives less friction. (a) True (b) False
6. 6.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) skating on ice (d) a rough doormat
9. 9.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🛞 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 11 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.True or false: a tyre with deep treads gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a box pushed on carpet (d) oil on a squeaky hinge
18. 18.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
19. 19.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
20. 20.True or false: chalk on a gym bar gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
24. 24.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) sand on a slippery path (d) chalk on a gym bar
26. 26.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) chalk on a gym bar
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
28. 28.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a wheel on ball bearings (d) a box pushed on carpet
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wet tiled floor (d) a wheel on ball bearings
38. 38.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a box pushed on carpet (d) a rough doormat
39. 39.🛞 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 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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