Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 560 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
3. 3.🛞 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 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
7. 7.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.True or false: powder on a carrom board gives less friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a rough doormat (d) sand on a slippery path
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 carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a tyre with deep treads
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
15. 15.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
16. 16.True or false: a smooth steel slide gives more friction. (a) False (b) True
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) skating on ice (d) powder on a carrom board
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
23. 23.🛞 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 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
28. 28.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) chalk on a gym bar (d) a wet tiled floor
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
38. 38.🛞 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 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (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: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper

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