Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 337 · 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.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a wheel on ball bearings
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
3. 3.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
8. 8.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
9. 9.True or false: skating on ice gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
11. 11.🛞 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 8 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
15. 15.🔍 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
16. 16.True or false: a tyre with deep treads 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: a carpet 9 N, sandpaper 12 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
22. 22.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
24. 24.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a smooth steel slide (d) powder on a carrom board
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) sand on a slippery path (d) a box pushed on carpet
26. 26.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
27. 27.🛞 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 11 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
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) chalk on a gym bar
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
33. 33.True or false: a box pushed on carpet 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: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 14 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a box pushed on carpet (d) skating on ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?

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