Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 192 · 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: powder on a carrom board? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a smooth steel slide (d) a rough doormat
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a tyre with deep treads (d) oil on a squeaky hinge
6. 6.True or false: a smooth steel slide gives more friction. (a) True (b) False
7. 7.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a rough doormat (d) a tyre with deep treads
9. 9.True or false: skating on ice gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a smooth steel slide (d) a wet tiled floor
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.True or false: a grippy rubber sole gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
14. 14.True or false: a rough doormat gives less friction. (a) True (b) False
15. 15.True or false: a tyre with deep treads gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
18. 18.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
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 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
21. 21.🛞 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 12 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
26. 26.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
27. 27.True or false: a box pushed on carpet gives more friction. (a) True (b) False
28. 28.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a rough doormat (d) skating on ice
30. 30.True or false: powder on a carrom board gives less friction. (a) False (b) True
31. 31.True or false: a rough doormat gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: a grippy rubber sole gives more friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
37. 37.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
38. 38.True or false: skating on ice gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful

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