Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 193 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 11 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on a carpet than on ice?
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wet tiled floor (d) skating on ice
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wet tiled floor (d) oil on a squeaky hinge
7. 7.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
8. 8.True or false: sand on a slippery path gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: powder on a carrom board gives more friction. (a) True (b) False
12. 12.🛞 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 8 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.🛞 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, sandpaper 8 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: a grippy rubber sole gives less friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) powder on a carrom board (d) chalk on a gym bar
17. 17.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
18. 18.True or false: skating on ice gives less friction. (a) False (b) True
19. 19.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
20. 20.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) skating on ice (d) a grippy rubber sole
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
24. 24.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
27. 27.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
28. 28.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
31. 31.🛞 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 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
32. 32.🛞 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 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
38. 38.True or false: a smooth steel slide gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 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, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper

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