Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 171 · 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 box pushed on carpet (c) oil on a squeaky hinge (d) a rough doormat
2. 2.True or false: powder on a carrom board gives more friction. (a) False (b) True
3. 3.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a smooth steel slide (d) a wet tiled floor
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.True or false: a tyre with deep treads gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🛞 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 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
13. 13.🛞 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 carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.🛞 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, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) sand on a slippery path
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) skating on ice (d) oil on a squeaky hinge
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
23. 23.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
26. 26.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a grippy rubber sole (d) a rough doormat
27. 27.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
28. 28.🛞 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 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) chalk on a gym bar (d) a grippy rubber sole
30. 30.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
31. 31.🛞 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 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
38. 38.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a rough doormat (d) chalk on a gym bar

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